Americam Chemical Society

日本セラミックス協会

応用物理学会

Realization of Non‐Equilibrium Wurtzite Structure in Heterovalent Ternary MgSiN₂ Film Grown by Reactive Sputtering

Sotaro Kageyama, Kazuki Okamoto, Shinnosuke Yasuoka, Keisuke Ide, Kota Hanzawa, Yoshiomi Hiranaga, Pochun Hsieh, Sankalpa Harza, Albert Suceava, Akash Saha, Hiroko Yokota, Kei Shigematsu, Masaki Azuma, Venkatraman Gopalan, Hiroshi Uchida, Hidenori Hiramatsu, Hiroshi Funakubo

Advanced Electronic Materials   2025.2

Nanosecond electric pulse-induced ultrafast piezoelectric responses in Co³⁺ substituted BiFeO₃ epitaxial thin films

Sanjith Unithrattil, Taewon Min, Gopinathan Anoop, Jun Young Lee, Tae Yeon Kim, Shibnath Samanta, Yubo Qi, Jiahao Zhang, Seung Hyun Hwang, Hyeon Jun Lee, Kun Guo, Su Yong Lee, Yasuhiko Imai, Osami Sakata, Keisuke Shimizu, Kei Shigematsu, Hajime Hojo, Kui Yao, Masaki Azuma, Jaekwang Lee, Andrew M. Rappe, Ji Young Jo

CURRENT APPLIED PHYSICS   70   76 - 80   2025.2

Universal Waterfall Feature in Cuprate Superconductors: Evidence of a Momentum-Driven Crossover

Benjamin Bacq-Labreuil, Chafic Fawaz, Yuichi Okazaki, Yukiko Obata, Hervé Cercellier, Patrick Le Fèvre, François Bertran, David Santos-Cottin, Hajime Yamamoto, Ikuya Yamada, Masaki Azuma, Koji Horiba, Hiroshi Kumigashira, Matteo D'Astuto, Silke Biermann, Benjamin Lenz

Physical Review Letters   134 ( 1 )   2025.1

Crystal structure and magnetoresistance of vacancy-ordered perovskite SrV0.3Fe0.7O2.8 at low temperature

Teppei Nagase, Takumi Nishikubo, Yuki Sakai, Kei Shigematsu, Ko Mibu, Masato Hagihala, Masaki Azuma, Takafumi Yamamoto

CrystEngComm   2025

Effects of the anion exchange between I− and NCS− coordinated to Co2+-centered tetrahedra in the organic–inorganic hybrid halides

Takuya Ohmi, Ryuju Ito, Sergey A. Nikolaev, Kotaro Fujii, Iain W. H. Oswald, Koki Matsushima, Yuiga Nakamura, James R. Neilson, Masatomo Yashima, Masaki Azuma, Takafumi Yamamoto

Dalton Transactions   2025

Tunable optical properties in the (110)p-oriented layered halide perovskite FA4Pb2I7.5(SCN)0.5 by Br substitution

Koki Matsushima, Takuya Ohmi, Wataru Taniguchi, Shoya Nagano, Tomoya Fukui, Takanori Fukushima, Muhammad Awais, Makhsud Saidaminov, Masaki Azuma, Takafumi Yamamoto

Dalton Transactions   2025

Photocontrol of ferroelectricity in multiferroic BiFeO₃ via structural modification coupled with photocarrier

Kou Takubo, Atsushi Ono, Shunsuke Ueno, Samiran Banu, Hongwu Yu, Kaito En-ya, Ryota Nishimori, Makoto Kuwahara, Toru Asaka, Kei Maeda, Daiki Ono, Keita Ozawa, Takuma Itoh, Kei Shigematsu, Masaki Azuma, Tadahiko Ishikawa, Yoichi Okimoto, Masaki Hada, Shin-ya Koshihara

COMMUNICATIONS MATERIALS   5 ( 1 )   2024.12

ZnVO3: an ilmenite-type vanadium oxide hosting robust V–V dimers Reviewed

Hajime Yamamoto, Takumi Nishikubo, Shintaro Kobayashi, Kazuki Takahashi, Masaki Azuma, Shogo Kawaguchi, Tadashi Abukawa

Dalton Transactions   2024.9

Pressure-Induced YbFe2O4-Type to Spinel Structural Change of InGaMgO4 Reviewed

Takehiro Koike, Hena Das, Kengo Oka, Yoshihiro Kusano, Fernando Cubillas, Francisco Brown Bojorqez, Victor Emmanuel Alvarez-Montano, Shigekazu Ito, Kei Shigematsu, Hayato Togano, Ikuya Yamada, Hiroki Ishibashi, Yoshiki Kubota, Shigeo Mori, Noboru Kimizuka, Masaki Azuma

Solids   2024.8

High-spin Co3+ as a trigger of weak ferromagnetism in Co-substituted BiFeO3 Reviewed

Koomok Lee, Hena Das, Yuki Sakai, Takumi Nishikubo, Kei Shigematsu, Daiki Ono, Takehiro Koike, Naomi Kawamura, Masaichiro Mizumaki, Naoki Ishimatsu, Masaki Azuma

Physical Review B   110 ( 2 )   2024.7

Mechanism of intermetallic charge transfer and bond disproportionation in BiNiO3 and PbNiO3 revealed by hard x-ray photoemission spectroscopy

Tatsuya Yamaguchi, Mizuki Furo, Yuki Sakai, Takumi Nishikubo, Hajime Hojo, Masaki Azuma, Kengo Oka, Daisuke Mori, Yoshiyuki Inaguma, Masaichiro Mizumaki, Kento Yamamoto, Jan Kuneš, Takashi Mizokawa, Atsushi Hariki

Physical Review B   109 ( 20 )   2024.5

FA4Pb2I7.5(SCN)0.5: n = 3 Member of Perovskite Homologous Series FAn+1Pbn−1I3n−1.5(SCN)0.5 with Columnar Defects

Takuya Ohmi, James R. Neilson, Wataru Taniguchi, Tomoya Fukui, Teppei Nagase, Yuki Haruta, Makhsud I. Saidaminov, Takanori Fukushima, Masaki Azuma, Takafumi Yamamoto

ACS Materials Letters   2024.5

Single or Vortex Ferroelectric and Ferromagnetic Domain Nanodot Array of Magnetoelectric BiFe_0.9Co_0.1O₃

Keita Ozawa, Yasuhito Nagase, Marin Katsumata, Kei Shigematsu, Masaki Azuma

ACS APPLIED MATERIALS & INTERFACES   16 ( 16 )   20930 - 20936   2024.4

Synthesis and Structure of Vacancy-Ordered Perovskite Ba6Ta2Na2X2O17 (X = P, V): Significance of Structural Model Selection on Discovered Compounds

Takafumi Yamamoto, Yuya Otsubo, Teppei Nagase, Taiki Kosuge, Masaki Azuma

Inorganic Chemistry   2024.3

Emergent Three-Dimensional Electric Dipole Sinewave in Bulk Perovskite Oxides

Botao Gao, Zhengyang Zhou, Shiqing Deng, Koomok Lee, Masayuki Fukuda, Lei Hu, Masaki Azuma, Hui Liu, Jun Chen

Nano Letters   24 ( 10 )   3118 - 3124   2024.2

Pressure Induced Amorphization of Pb²⁺ and Pb⁴⁺ in Perovskite PbFeO₃

Qiumin Liu, Hena Das, Takumi Nishikubo, Yuki Sakai, Ko Mibu, Tomoko Onoue, Takateru Kawakami, Tetsu Watanuki, Akihiko Machida, Xubin Ye, Jianhong Dai, Zhao Pan, Lei Hu, Satoshi Nakano, Masayuki Fukuda, Shiori Kihara, Koomok Lee, Takehiro Koike, Youwen Long, Masaki Azuma

Chemistry of Materials   36 ( 4 )   1899 - 1907   2024.2

Integrating abnormal thermal expansion and ultralow thermal conductivity into (Cd<inf>,</inf>Ni)<inf>2</inf>Re<inf>2</inf>O<inf>7</inf> via synergy of local structure distortion and soft acoustic phonons

Feiyu Qin, Lei Hu, Yingcai Zhu, Yuki Sakai, Shogo Kawaguchi, Akihiko Machida, Tetsu Watanuki, Yue Wen Fang, Jun Sun, Xiangdong Ding, Masaki Azuma

Acta Materialia   264   2024.1

Siliceous zeolite-derived topology of amorphous silica

Hirokazu Masai, Shinji Kohara, Toru Wakihara, Yuki Shibazaki, Yohei Onodera, Atsunobu Masuno, Sohei Sukenaga, Koji Ohara, Yuki Sakai, Julien Haines, Claire Levelut, Philippe Hébert, Aude Isambert, David A. Keen, Masaki Azuma

Communications Chemistry   6 ( 1 )   2023.12

Magnetic Domain Change Induced by In-Plane Electric Polarization Switching in Bi(Fe, Co)O₃ Thin Film

Kei Shigematsu, Marin Katsumata, Takuma Itoh, Keita Ozawa, Haruki Shimizu, Keisuke Shimizu, Masaki Azuma

ADVANCED PHYSICS RESEARCH   2 ( 12 )   2023.12

3D Visualization of Morphological Evolution of Large Defects during Spark Plasma Sintering of Alumina Granules

Gaku Okuma, Masaya Endo, Haruki Minagawa, Ryo Inoue, Hideki Kakisawa, Takuma Kohata, Toshio Osada, Takafumi Yamamoto, Masaki Azuma, Akihisa Takeuchi, Masayuki Uesugi, Olivier Guillon, Fumihiro Wakai

Advanced Engineering Materials   2023.9

Thiocyanate-Stabilized Pseudo-cubic Perovskite CH(NH₂)₂PbI₃ from Coincident Columnar Defect Lattices

Takuya Ohmi, Iain W. H. Oswald, James R. Neilson, Nikolaj Roth, Shunta Nishioka, Kazuhiko Maeda, Kotaro Fujii, Masatomo Yashima, Masaki Azuma, Takafumi Yamamoto

Journal of the American Chemical Society   145 ( 36 )   19759 - 19767   2023.8

Selective Synthesis of Perovskite Oxyhydrides Using a High-Pressure Flux Method

Jinya Suzuki, Hiroyasu Okochi, Naoki Matsui, Teppei Nagase, Haruki Tochizawa, Hiroki Sahara, Takumi Nishikubo, Yuki Sakai, Takuya Ohmi, Zhao Pan, Takashi Saito, Hiroyuki Saitoh, Atsunori Ikezawa, Hajime Arai, Ryoji Kanno, Takafumi Yamamoto, Masaki Azuma

Journal of the American Chemical Society   145 ( 30 )   16398 - 16405   2023.8

Theoretical Prediction and High-Pressure Synthesis of New LISICON-Type Solid-State Electrolyte Li_2.75[B_0.625P_0.125S_0.25]O_3.375

Masahito Ikeda, Randy Jalem, Gen Hasegawa, Naoaki Kuwata, Qiumin Liu, Takafumi Yamamoto, Kei Shigematsu, Yoshitaka Tateyama, Masaki Azuma

The Journal of Physical Chemistry C   2023.7

Paramagnon dispersion and damping in doped <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Na</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi>Ca</mml:mi><mml:mrow><mml:mn>2</mml:mn><mml:mtext>−</mml:mtext><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>CuO</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Cl</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>

Blair W. Lebert, Benjamin Bacq-Labreuil, Mark P. M. Dean, Kari Ruotsalainen, Alessandro Nicolaou, Simo Huotari, Ikuya Yamada, Hajime Yamamoto, Masaki Azuma, Nicholas B. Brookes, Flora Yakhou, Hu Miao, David Santos-Cottin, Benjamin Lenz, Silke Biermann, Matteo d'Astuto

Physical Review B   108 ( 2 )   2023.7

A-Site Columnar-Ordered Perovskite CaZnV2O6 as a Pauli-Paramagnetic Metal Reviewed

Masayuki Fukuda, Takumi Nishikubo, Hongwu Yu, Yoichi Okimoto, Shin-ya Koshihara, Kazunari Yamaura, Masaki Azuma

Inorganic Chemistry   62   8372 - 8378   2023.5

Out-of-plane polarization reversal and changes in in-plane ferroelectric and ferromagnetic domains of multiferroic BiFe_0.9Co_0.1O₃ thin films by water printing

Takuma Itoh, Kei Shigematsu, Takumi Nishikubo, Masaki Azuma

SCIENTIFIC REPORTS   13 ( 1 )   2023.5

Compaction of α”-Fe16N2 particles by high-pressure treatment at several gigapascals

K. Oka, T. Ogawa, H. Yamamoto, C. Sakaguchi, R. Gallage, N. Kobayashi, M. Azuma

Scripta Materialia   229   115390 - 115390   2023.5

Emergence of Dynamically‐Disordered Phases During Fast Oxygen Deintercalation Reaction of Layered Perovskite

Takafumi Yamamoto, Shogo Kawaguchi, Taiki Kosuge, Akira Sugai, Naoki Tsunoda, Yu Kumagai, Kosuke Beppu, Takuya Ohmi, Teppei Nagase, Kotaro Higashi, Kazuo Kato, Kiyofumi Nitta, Tomoya Uruga, Seiji Yamazoe, Fumiyasu Oba, Tsunehiro Tanaka, Masaki Azuma, Saburo Hosokawa

Advanced Science   2023.4

Pressure-Modulated Magnetism and Negative Thermal Expansion in the Ho₂Fe₁₇ Intermetallic Compound

Yili Cao, Haowei Zhou, Sergii Khmelevskyi, Kun Lin, Maxim Avdeev, Chin-Wei Wang, Bingjie Wang, Fengxia Hu, Kenichi Kato, Takanori Hattori, Jun Abe, Koji Ohara, Saori Kawaguchi, Qiang Li, Masayuki Fukuda, Takumi Nishikubo, Koomok Lee, Takehiro Koike, Qiumin Liu, Jun Miao, Jinxia Deng, Baogen Shen, Masaki Azuma, Xianran Xing

Chemistry of Materials   35 ( 8 )   3249 - 3255   2023.4

High pressure studies of transition metal oxides Reviewed

Masaki Azuma, Ikuya Yamada, Kazunari Yamaura, Alexei A. Belik, Takafumi Yamamoto, Masayuki Fukuda

Comprehensive Inorganic Chemistry III   681 - 718   2023.4

Two Types of Negative Thermal Expansion Observed in PbCr_1–xTi_xO₃

Yuki Sakai, Kana Matsuno, Takumi Nishikubo, Masayuki Fukuda, Shogo Wakazaki, Masahito Ikeda, Kazuki Takahashi, Zhao Pan, Lei Hu, Masaki Azuma

Chemistry of Materials   35 ( 3 )   1008 - 1015   2023.1

Polar–Nonpolar Transition-Type Negative Thermal Expansion with 11.1% Volume Shrinkage by Design

Takumi Nishikubo, Takashi Imai, Yuki Sakai, Masaichiro Mizumaki, Shogo Kawaguchi, Norihiro Oshime, Ayumu Shimada, Kento Sugawara, Kenji Ohwada, Akihiko Machida, Tetsu Watanuki, Kosuke Kurushima, Shigeo Mori, Takashi Mizokawa, Masaki Azuma

Chemistry of Materials   2023.1

Experimental and ab initio studies on the structural, magnetic, photocatalytic, and antibacterial properties of Cu-doped ZnO nanoparticles Reviewed

Ariunzaya Tsogoo, Ninjbadgar Tsedev, Alain Gibaud, Philippe Daniel, Abdelhadi Kassiba, Masayuki Fukuda, Yoshihiro Kusano, Masaki Azuma, Namsrai Tsogbadrakh, Galbadrakh Ragchaa, Rentsenmyadag Dashzeveg, Erdene-Ochir Ganbold

RSC Advances   13 ( 2 )   1256 - 1266   2023.1

Magnetization Controlled by Crystallization in Soft Magnetic Fe-Si-B-P-Cu Alloys Reviewed International journal

Hiroshi Nakajima, Akihiro Osako, Noriharu Yodoshi, Yoshiharu Yamada, Hirofumi Tsukasaki, Ken Harada, Yuki Sakai, Kei Shigematsu, Takumi Nishikubo, Masaki Azuma, Shigeo Mori

Microscopy   2022.8

Bi0.5Pb0.5FeO3 with Unusual Pb Charge Disproportionation: Indication of a Systematic Charge Distribution Change in Bi0.5Pb0.5MO3 (M: 3d Transition Metal)

Shiori Kihara, Yuki Sakai, Shogo Wakazaki, Takumi Nishikubo, Takehiro Koike, Ko Mibu, Hongwu Yu, Yoichi Okimoto, Shin-ya Koshihara, Masaki Azuma

Inorganic Chemistry   2022.8

Negative Thermal Expansion in Fluoroapatite Pb5(VO4)3F Enhanced by the Steric Effect of Pb2+

Kengo Oka, Miho Takasu, Wataru Nishiki, Takumi Nishikubo, Masaki Azuma, Naoki Noma, Mitsunobu Iwasaki

Inorganic Chemistry   2022.8

Quest for Colossal Negative Thermal Expansion Materials

Masaki AZUMA, Kengo OKA, Hajime YAMAMOTO, Yuki SAKAI

Journal of the Japan Society of Powder and Powder Metallurgy   69 ( 8 )   356 - 361   2022.8

Suppression of Pressure-Induced Phase Transitions in a Monoclinically Distorted LiNbO₃-Type CuNbO₃ by Preference for a CuO₃ Triangular Coordination Environment

Masayuki Fukuda, Hidenobu Murata, Takumi Nishikubo, Qiumin Liu, Koomok Lee, Takehiro Koike, Yuma Takahashi, Saori I. Kawaguchi, Naohisa Hirao, Hiroshi Funakubo, Masaki Azuma

Inorganic Chemistry   61 ( 32 )   12719 - 12725   2022.8

Heteroepitaxial growth of InSb thin film on SrTiO₃ (001) by pulsed laser deposition for magnetic Hall sensor application

Koomok Lee, Kei Shigematsu, Masaki Azuma

JAPANESE JOURNAL OF APPLIED PHYSICS   61 ( 8 )   2022.8

Temperature-induced structural transition in an organic-inorganic hybrid layered perovskite (MA)(2)PbI2-xBrx(SCN)(2)

Takuya Ohmi, Tomoaki Miura, Kei Shigematsu, Alexandra A. Koegel, Brian S. Newell, James R. Neilson, Tadaaki Ikoma, Masaki Azuma, Takafumi Yamamoto

CRYSTENGCOMM   24 ( 30 )   5428 - 5434   2022.8

Bulk charge density wave and electron-phonon coupling in superconducting copper oxychlorides

L. Chaix, B. Lebert, H. Miao, A. Nicolaou, F. Yakhou, H. Cercellier, S. Grenier, N. B. Brookes, A. Sulpice, S. Tsutsui, A. Bosak, L. Paolasini, D. Santos-Cottin, H. Yamamoto, I. Yamada, M. Azuma, T. Nishikubo, T. Yamamoto, M. Katsumata, M. P. M. Dean, M. d'Astuto

Physical Review Research   4 ( 3 )   2022.7

Two Distinct Cu(II)-V(IV) Superexchange Interactions with Similar Bond Angles in a Triangular "CuV2" Fragment. International journal

Yiran Wang, Masayuki Fukuda, Sergey Nikolaev, Atsushi Miyake, Kent J Griffith, Matthew L Nisbet, Emily Hiralal, Romain Gautier, Brandon L Fisher, Masashi Tokunaga, Masaki Azuma, Kenneth R Poeppelmeier

Inorganic chemistry   61 ( 26 )   10234 - 10241   2022.7

SrV_0.3Fe_0.7O_2.8: A Vacancy-Ordered Fe-Based Perovskite Exhibiting Room-Temperature Magnetoresistance

Teppei Nagase, Takumi Nishikubo, Masayuki Fukuda, Yuki Sakai, Kei Shigematsu, Yoichi Ikeda, Yusuke Nambu, Qiang Zhang, Masaaki Matsuda, Ko Mibu, Masaki Azuma, Takafumi Yamamoto

Inorganic Chemistry   61 ( 24 )   8987 - 8991   2022.6

Exploring the correlation between the spin-state configuration and the magnetic order in Co-substituted BiFeO₃

Koomok Lee, Kei Shigematsu, Hena Das, Masaki Azuma

PHYSICAL REVIEW MATERIALS   6 ( 6 )   2022.6

Transformation of Thermal Expansion from Large Volume Contraction to Nonlinear Strong Negative Thermal Expansion in PbTiO3–Bi(Co1–xFex)O3 Perovskites

Zhao Pan, Xingxing Jiang, Runze Yu, Yang Ren, Zheshuai Lin, Jun Chen, Masaki Azuma, Xianran Xing

ACS Applied Materials & Interfaces   14 ( 20 )   23610 - 23616   2022.5

V–V Dimerization and Magnetic State of Cobalt Ions in Ilmenite-Type CoVO₃

Sachiko Kamiyama, Ikuya Yamada, Masayuki Fukuda, Yuichi Okazaki, Takashi Nakamura, Takumi Nishikubo, Masaki Azuma, Hiroyuki Kimura, Hajime Yamamoto

Inorganic Chemistry   61 ( 20 )   7841 - 7846   2022.5

Large negative thermal expansion induced by cation dimerization in ilmenite-type vanadate ceramic Reviewed

Hajime Yamamoto, Sachiko Kamiyama, Takumi Nishikubo, Masaki Azuma, Ikuya Yamada, Hiroyuki Kimura

Applied Physics Letters   120   201901   2022.5

Sequential Pressure-Induced B1–B2 Transitions in the Anion-Ordered Oxyhydride Ba2YHO3 Reviewed

Harry W. T. Morgan, Takafumi Yamamoto, Takumi Nishikubo, Takuya Ohmi, Takehiro Koike, Yuki Sakai, Masaki Azuma, Hirofumi Ishii, Genki Kobayashi, John E. McGrady

Inorganic Chemistry   2022.5

Tolerance Factor Control of Tetragonality and Negative Thermal Expansion in PbTiO₃-Based Ferroelectrics

Zhao Pan, Yue-Wen Fang, Takumi Nishikubo, Lei Hu, Shogo Kawaguchi, Masaki Azuma

Chemistry of Materials   34 ( 6 )   2798 - 2803   2022.3

Realization of Negative Thermal Expansion in Lead-Free Bi_0.5K_0.5VO₃ by the Suppression of Tetragonality

Zhao Pan, Takehiro Koike, Takumi Nishikubo, Lei Hu, Qiumin Liu, Yuki Sakai, Shogo Kawaguchi, Masaki Azuma

Inorganic Chemistry   61 ( 8 )   3730 - 3735   2022.2

Control of ferroelectric and ferromagnetic domains in BiFe_0.9Co_0.1O₃ thin films by utilizing trailing fields

Takuma Itoh, Marin Katsumata, Kei Shigematsu, Masaki Azuma

APPLIED PHYSICS EXPRESS   15 ( 2 )   2022.2

High-Pressure Synthesis and Lithium-Ion Conduction of Li4OBr2 Derivatives with a Layered Inverse-Perovskite Structure

Shogo Wakazaki, Qiumin Liu, Randy Jalem, Takumi Nishikubo, Yuki Sakai, Naoki Matsui, Guowei Zhao, Kota Suzuki, Kei Shigematsu, Takafumi Yamamoto, Ryoji Kanno, Hena Das, Yoshitaka Tateyama, Masaki Azuma

Chemistry of Materials   33 ( 23 )   9194 - 9201   2021.11

Enhanced Piezoelectric Response in Orientation-Controlled BiFe1–xGaxO3 Thin Films with Polarization Rotation

Keisuke Shimizu, Hajime Hojo, Masaki Azuma

ACS Applied Electronic Materials   3 ( 10 )   4459 - 4464   2021.10

High-Pressure and High-Temperature Synthesis of Anion-Disordered Vanadium Perovskite Oxyhydrides

Kazumasa Miyazaki, Masayuki Ochi, Takumi Nishikubo, Jinya Suzuki, Takashi Saito, Takashi Kamiyama, Kazuhiko Kuroki, Takafumi Yamamoto, Masaki Azuma

Inorganic Chemistry   60 ( 20 )   15751 - 15758   2021.10

Origin and Absence of Giant Negative Thermal Expansion in Reduced and Oxidized Ca2RuO4

Lei Hu, Yingcai Zhu, Yue-Wen Fang, Masayuki Fukuda, Takumi Nishikubo, Zhao Pan, Yuki Sakai, Shogo Kawaguchi, Hena Das, Akihiko Machida, Tetsu Watanuki, Shigeo Mori, Koshi Takenaka, Masaki Azuma

Chemistry of Materials   33 ( 19 )   7665 - 7674   2021.10

Quantum spin fluctuations and hydrogen bond network in the antiferromagnetic natural mineral henmilite

Hajime Yamamoto, Terutoshi Sakakura, Harald O. Jeschke, Noriyuki Kabeya, Kanata Hayashi, Yuya Ishikawa, Yutaka Fujii, Shunji Kishimoto, Hajime Sagayama, Kei Shigematsu, Masaki Azuma, Akira Ochiai, Yukio Noda, Hiroyuki Kimura

PHYSICAL REVIEW MATERIALS   5 ( 10 )   2021.10

Stabilization of correlated ferroelectric and ferromagnetic domain structures in BiFe0.9Co0.1O3 films

Marin Katsumata, Kei Shigematsu, Takuma Itoh, Haruki Shimizu, Keisuke Shimizu, Masaki Azuma

Applied Physics Letters   119 ( 13 )   132901 - 132901   2021.9

Functional Transition Metal Perovskite Oxides with 6s2 Lone Pair Activity Stabilized by High-Pressure Synthesis

Masaki Azuma, Hajime Hojo, Kengo Oka, Hajime Yamamoto, Keisuke Shimizu, Kei Shigematsu, Yuki Sakai

Annual Review of Materials Research   51 ( 1 )   329 - 349   2021.7

Crystal Structures and Electronic States of High-Pressure-Synthesized (1-x)PbVO3-xBiCrO3 Solid Solutions

Hajime Yamamoto, Haruna Aizawa, Ikuya Yamada, Kaoru Toda, Atsushi Tanaka, Masaki Azuma, Yuki Sakai, Takumi Nishikubo, Hiroyuki Kimura

Journal of Asian Ceramic Societies   9 ( 3 )   1147 - 1153   2021.7

Intermetallic Charge Transfer in V-Substituted PbCrO3. International journal

Takahiro Ogata, Yuki Sakai, Takumi Nishikubo, Takashi Mizokawa, Masaichiro Mizumaki, Koomok Lee, Qiumin Liu, Masaki Azuma

Inorganic chemistry   2021.4

Erratum to: Synthesis and microstructure of single-crystalline cobalt oxyhydroxide and topotactic transformation to cobalt oxide (Journal of the American Ceramic Society, (2020), 103, 12, (7240-7246), 10.1111/jace.17140)

Yoshihiro Kusano, Shuji Kawasaki, Jun Takada, Masaki Azuma

Journal of the American Ceramic Society   104 ( 4 )   1908   2021.4

Observation of novel charge ordering and spin reorientation in perovskite oxide PbFeO3

Xubin Ye, Jianfa Zhao, Hena Das, Denis Sheptyakov, Junye Yang, Yuki Sakai, Hajime Hojo, Zhehong Liu, Long Zhou, Lipeng Cao, Takumi Nishikubo, Shogo Wakazaki, Cheng Dong, Xiao Wang, Zhiwei Hu, Hong-Ji Lin, Chien-Te Chen, Christoph Sahle, Anna Efiminko, Huibo Cao, Stuart Calder, Ko Mibu, Michel Kenzelmann, Liu Hao Tjeng, Runze Yu, Masaki Azuma, Changqing Jin, Youwen Long

Nature Communications   12 ( 1 )   2021.3

Polarization- and Strain-Mediated Control of Negative Thermal Expansion and Ferroelasticity in BiInO3–BiZn1/2Ti1/2O3

Takumi Nishikubo, Takahiro Ogata, Lalitha Kodumudi Venkataraman, Daniel Isaia, Zhao Pan, Yuki Sakai, Lei Hu, Shogo Kawaguchi, Akihiko Machida, Tetsu Watanuki, Hongwu Yu, Yoichi Okimoto, Shin-ya Koshihara, Shigeo Mori, Jürgen Rödel, Masaki Azuma

Chemistry of Materials   33 ( 4 )   1498 - 1505   2021.2

Analysis of Glass Behavior of Lu2Fe3O7 with Distributed Equivalent Circuit Model

Yukimasa Fukada, Ryota Fukuyama, Kosuke Fujiwara, Kenji Yoshii, Kei Shigematsu, Masaki Azuma, Naoshi Ikeda

Journal of the Physical Society of Japan   90 ( 2 )   024710 - 024710   2021.2

Polarization Rotation at Morphotropic Phase Boundary in New Lead-Free Na1/2Bi1/2V1–xTixO3 Piezoceramics

Zhao Pan, Mao-Hua Zhang, Takumi Nishikubo, Yuki Sakai, Hajime Yamamoto, Hajime Hojo, Masayuki Fukuda, Lei Hu, Hayato Ishizaki, Satoru Kaneko, Shogo Kawaguchi, Jurij Koruza, Jürgen Rödel, Masaki Azuma

ACS Applied Materials & Interfaces   13 ( 4 )   5208 - 5215   2021.2

Spin Transition in BiCoO3 Correlated with Large Polar Distortion and Its Applications

Kengo Oka, Masaki Azuma

Spin-Crossover Cobaltite   147 - 158   2021

Topochemical synthesis of perovskite-type CuNb2O6 with colossal dielectric constant

Masayuki Fukuda, Ikuya Yamada, Hajime Hojo, Chihiro Takahashi, Yuya Yoshida, Katsuhisa Tanaka, Masaki Azuma, Koji Fujita

Journal of Materials Chemistry C   9 ( 39 )   13981 - 13990   2021

Synthesis and microstructure of single‐crystalline cobalt oxyhydroxide and topotactic transformation to cobalt oxide

Yoshihiro Kusano, Shuji Kawasaki, Jun Takada, Masaki Azuma

Journal of the American Ceramic Society   103 ( 12 )   7240 - 7246   2020.12

Stabilized Charge, Spin, and Orbital Ordering by the 6s2 Lone Pair in Bi0.5Pb0.5MnO3

Shogo Wakazaki, Takumi Nishikubo, Yuki Sakai, Kei Shigematsu, Hena Das, Depei Zhang, Qiang Zhang, Masaaki Matsuda, Masaki Azuma

Inorganic Chemistry   59 ( 18 )   13390 - 13397   2020.9

Reversible thermally controlled spontaneous magnetization switching in perovskite-type manganite

Hajime Yamamoto, Satoru Sekikawa, Haruka Taniguchi, Michiaki Matsukawa, Kei Shigematsu, Takashi Honda, Kunihiko Yamauchi, Kazutaka Ikeda, Toshiya Otomo, Terutoshi Sakakura, Masaki Azuma, Shigeki Nimori, Yukio Noda, Hiroyuki Kimura

Applied Physics Letters   117 ( 11 )   112404 - 112404   2020.9

Hydrothermal synthesis and crystal structure of a mixed-valence pyrochlore-type strontium bismuthate, (Sr0.75Bi0.25)2Bi2O6.83

M. D. Saiduzzaman, Khandaker Monower Hossain, Nobuhiro Kumada, Sayaka Yanagida, Takahiro Takei, Yuji Hanada, Masanori Nagao, Masaki Azuma

Journal of the Ceramic Society of Japan   128 ( 9 )   660 - 663   2020.9

Negative Thermal Expansion Induced by Simultaneous Charge Transfer and Polar-Nonpolar Transitions

Yuki SAKAI, Takumi NISHIKUBO, Masaki AZUMA

Nihon Kessho Gakkaishi   62 ( 3 )   135 - 136   2020.8

Enhanced Spontaneous Polarization by V⁴⁺Substitution in a Lead-Free Perovskite CaMnTi<inf>2</inf>O<inf>6</inf>

Masayuki Fukuda, Takumi Nishikubo, Zhao Pan, Yuki Sakai, Mao Hua Zhang, Shogo Kawaguchi, Hongwu Yu, Yoichi Okimoto, Shin Ya Koshihara, Mitsuru Itoh, Jürgen Rödel, Masaki Azuma

Inorganic Chemistry   59 ( 16 )   11749 - 11756   2020.8

Emergence of a Cubic Phase Stabilized by Intermetallic Charge Transfer in (1 – x)PbVO3–xBiCoO3 Solid Solutions Reviewed

Hajime Yamamoto, Kaoru Toda, Yuki Sakai, Takumi Nishikubo, Ikuya Yamada, Kei Shigematsu, Masaki Azuma, Hajime Sagayama, Masaichiro Mizumaki, Kiyofumi Nitta, Hiroyuki Kimura

Chemistry of Materials   2020.8

High-Brightness Red-Emitting Phosphor La3(Si,Al)6(O,N)11:Ce3+ for Next-Generation Solid-State Light Sources

Mitsuru Nitta, Nobuaki Nagao, Yuki Nomura, Taku Hirasawa, Yuki Sakai, Takahiro Ogata, Masaki Azuma, Shuki Torii, Toru Ishigaki, Yasuhisa Inada

ACS Applied Materials & Interfaces   12 ( 28 )   31652 - 31658   2020.7

Long-term heat-storage ceramics absorbing thermal energy from hot water

Yoshitaka Nakamura, Yuki Sakai, Masaki Azuma, Shin-ichi Ohkoshi

Science Advances   6 ( 27 )   2020.7

Stable electric polarization switching accompanied by magnetization reversal in B-site-substituted multiferroic BiFe0.9Co0.1O3 thin films Reviewed

Kei Shigematsu, Haruki Shimizu, Marin Katsumata, Keisuke Shimizu, Hajime Yamamoto, Ko Mibu, Masaki Azuma

Applied Physics Express   13   071001   2020.7

Annealing effect on local structure and negative thermal expansion of antiperovskite manganese nitride fine particles

Masaki Ozeki, Victoria Warne-Lang, Hirofumi Tsukasaki, Yuki Sakai, Naoyuki Katayama, Yoshihiko Okamoto, Masaki Azuma, Shigeo Mori, Koshi Takenaka

APPLIED PHYSICS EXPRESS   13 ( 7 )   2020.7

Ultrafast Nonlinear Spectroscopy in (111) Oriented Bismuth Ferrite Oxide

Hongwu Yu, Kou Takubo, Tadahiko Ishikawa, Shin-ya Koshihara, Masaki Hada, Toru Asaka, Keita Ozawa, Kei Shigematsu, Masaki Azuma, Yoichi Okimoto

Journal of the Physical Society of Japan   89 ( 6 )   063401 - 063401   2020.6

Negative Thermal Expansion in Lead-Free La-Substituted Bi0.5Na0.5VO3 Reviewed

Hayato Ishizaki, Yuki Sakai, Takumi Nishikubo, Zhao Pan, Kengo Oka, Hajime Yamamoto, Masaki Azuma

Chemistry of Materials   32 ( 11 )   4832 - 4837   2020.6

Observation of Stabilized Monoclinic Phase as a “Bridge” at the Morphotropic Phase Boundary between Tetragonal Perovskite PbVO3 and Rhombohedral BiFeO3

Zhao Pan, Takumi Nishikubo, Yuki Sakai, Takafumi Yamamoto, Shogo Kawaguchi, Masaki Azuma

Chemistry of Materials   32 ( 8 )   3615 - 3620   2020.4

Sequential Spin State Transition and Intermetallic Charge Transfer in PbCoO3 Reviewed

Zhehong Liu, Yuki Sakai, Junye Yang, Wenmin Li, Ying Liu, Xubin Ye, Shijun Qin, Jinming Chen, Stefano Agrestini, Kai Chen, Sheng-Chieh Liao, Shu-Chih Haw, Francois Baudelet, Hirofumi Ishii, Takumi Nishikubo, Hayato Ishizaki, Tatsuru Yamamoto, Zhao Pan, Masayuki Fukuda, Kotaro Ohashi, Kana Matsuno, Akihiko Machida, Tetsu Watanuki, Saori I. Kawaguchi, Angel M. Arevalo-Lopez, Changqing Jin, Zhiwei Hu, J. Paul Attfield, Masaki Azuma, Youwen Long

Journal of the American Chemical Society   142 ( 12 )   5731 - 5741   2020.3

Doping-induced in-plane anisotropy of bond-stretching phonon softening in oxychloride Ca2−xCuO2Cl2 compounds

Blair W. Lebert, Hajime Yamamoto, Masaki Azuma, Rolf Heid, Satoshi Tsutsui, Hiroshi Uchiyama, Alfred Q. R. Baron, Benoît Baptiste, Matteo d'Astuto

Physical Review B   101 ( 2 )   2020.1

Electrical properties of pyrochlore-type silver tantalate and fluorite-type silver niobate Reviewed

W. I, U. WITHANAGE, Nobuhiro Kumada, Takahiro Takei, Sayaka YANAGIDA, Kiyoharu Tadanaga, Akira Miura, Nataly Carolina Rosero-Navarro, Masaki Azuma

JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   128 ( 1 )   46 - 50   2020.1

Development of Giant Negative Thermal-Expansion Materials Utilizing Pressure-Induced Phase Transitions

Masaki AZUMA, Yuki SAKAI, Takumi NISHIKUBO, Kengo OKA, Hajime YAMAMOTO

The Review of High Pressure Science and Technology   30 ( 3 )   187 - 194   2020

Lithium Ion Conduction in a Cation-Deficient Quadruple Perovskite LiCuTa<inf>3</inf>O<inf>9</inf>Epitaxial Thin Film: Theoretical and Experimental Investigations

Kotaro Ohashi, Kei Shigematsu, Hena Das, Kazumasa Yamamoto, Hirofumi Tsukasaki, Shigeo Mori, Masaki Azuma

Chemistry of Materials   2020

Fabrication and characterization of BiFe0.9Co0.1O3 nanodot array by using anodized alumina mask

Keita Ozawa, Marin Katsumata, Kei Shigematsu, Masaki Azuma

Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   67 ( 2 )   100 - 102   2020

Charge ordering and lone pair effect in Bi0.5Pb0.5MnO3

Shogo Wakazaki, Takumi Nishikubo, Yuki Sakai, Hena Das, Masaki Azuma

Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   67 ( 2 )   92 - 96   2020

Strain Manipulation of Magnetic Anisotropy in Room-Temperature Ferrimagnetic Quadruple Perovskite CeCu3Mn4O12

Kei Shigematsu, Keisuke Shimizu, Kazumasa Yamamoto, Takumi Nishikubo, Yuki Sakai, Sergey A. Nikolaev, Hena Das, Masaki Azuma

ACS Applied Electronic Materials   1 ( 12 )   2514 - 2521   2019.12

Robust Giant Tetragonal Distortion Coupled with High-Spin Co³⁺ in Electron-Doped BiCoO<inf>3</inf> Reviewed

Hayato Ishizaki, Hajime Yamamoto, Takumi Nishikubo, Yuki Sakai, Shogo Kawaguchi, Keisuke Yokoyama, Yoichi Okimoto, Shin Ya Koshihara, Takafumi Yamamoto, Masaki Azuma

Inorganic Chemistry   58 ( 23 )   16059 - 16064   2019.12

Enhanced Negative Thermal Expansion Induced by Simultaneous Charge Transfer and Polar-Nonpolar Transitions Reviewed International journal

Takumi Nishikubo, Yuki Sakai, Kengo Oka, Tetsu Watanuki, Akihiko Machida, Masaichiro Mizumaki, Koki Maebayashi, Takashi Imai, Takahiro Ogata, Keisuke Yokoyama, Yoichi Okimoto, Shin-ya Koshihara, Hajime Hojo, Takashi Mizokawa, Masaki Azuma

Journal of the American Chemical Society   141 ( 49 )   19397 - 19403   2019.11

Frustrated magnetic interactions in an S=3/2 bilayer honeycomb lattice compound Bi3Mn4O12(NO3) Reviewed

M. Matsuda, S. E. Dissanayake, D. L. Abernathy, Y. Qiu, J. R, D. Copley, N. Kumada, M. Azuma

PHYSICAL REVIEW B   100   134430   2019.10

Hydrothermal Synthesis and Crystal Structure of a (Ba0.54K0.46)4Bi4O12 Double-Perovskite Superconductor with Onset of the Transition Tc ∼ 30 K Reviewed

Md Saiduzzaman, Hikaru Yoshida, Takahiro Takei, Sayaka Yanagida, Nobuhiro Kumada, Masanori Nagao, Hisanori Yamane, Masaki Azuma, Mirza H. K. Rubel, Chikako Moriyoshi, Yoshihiro Kuroiwa

Inorganic Chemistry   58 ( 18 )   11997 - 12001   2019.9

Pronounced Negative Thermal Expansion in Lead-Free BiCoO3-Based Ferroelectrics Triggered by the Stabilized Perovskite Structure

Zhao Pan, Xingxing Jiang, Takumi Nishikubo, Yuki Sakai, Hayato Ishizaki, Kengo Oka, Zheshuai Lin, Masaki Azuma

Chemistry of Materials   31 ( 16 )   6187 - 6192   2019.8

Polar–Nonpolar Phase Transition Accompanied by Negative Thermal Expansion in Perovskite-Type Bi1–xPbxNiO3 Reviewed

Yuki Sakai, Takumi Nishikubo, Takahiro Ogata, Hayato Ishizaki, Takashi Imai, Masaichiro Mizumaki, Takashi Mizokawa, Akihiko Machida, Tetsu Watanuki, Keisuke Yokoyama, Yoichi Okimoto, Shin-ya Koshihara, Hena Das, Masaki Azuma

Chemistry of Materials   31 ( 13 )   4748 - 4758   2019.7

An electronic structure governed by the displacement of the indium site in In–S6 octahedra: LnOInS2 (Ln = La, Ce, and Pr) Reviewed

Ito, Hiroaki, Miura, Akira, Goto, Yosuke, Mizuguchi, Yoshikazu, Moriyoshi,Chikako, Kuroiwa, Yoshihiro, Azuma, Masaki, Liu, Jinjia, Wen, Xiao-Dong, Nishioka,Shunta, Maeda, Kazuhiko, Masubuchi, Yuji, Rosero-Navarro, Nataly Carolina, Tadanaga, Kiyoharu

Dalton Transactions   48 ( 32 )   12272 - 12278   2019.6

Phase transition‐type giant negative thermal expansion materials

東正樹, 岡研吾, 山本孟, 酒井雄樹

応用物理   88 ( 3 )   185‐188   2019.3

Direct Observation of Magnetization Reversal by Electric Field at Room Temperature in Co-Substituted Bismuth Ferrite Thin Film Reviewed

Shimizu Keisuke, Kawabe Ryo, Hojo Hajime, Shimizu Haruki, Yamamoto Hajime, Katsumata Marin, Shigematsu Kei, Mibu Ko, Kumagai Yu, Oba Fumiyasu, Azuma Masaki

Nano Letters   19 ( 3 )   1767 - 1773   2019.3

Large Negative Thermal Expansion Induced by Synergistic Effects of Ferroelectrostriction and Spin Crossover in PbTiO3-Based Perovskites Reviewed

Pan Zhao, Chen Jun, Yu Runze, Patra Lokanath, Ravindran Ponniah, Sanson Andrea, Milazzo Ruggero, Carnera Alberto, Hu Lei, Wang Lu, Yamamoto Hajime, Ren Yang, Huang Qingzhen, Sakai Yuki, Nishikubo Takumi, Ogata Takahiro, Fan Xi'an, Li Yawei, Li Guangqiang, Hojo Hajime, Azuma Masaki, Xing Xianran

CHEMISTRY OF MATERIALS   31 ( 4 )   1296 - 1303   2019.2

Melting of d(xy) Orbital Ordering Accompanied by Suppression of Giant Tetragonal Distortion and Insulator-to-Metal Transition in Cr-Substituted PbVO3 Reviewed

Ogata Takahiro, Sakai Yuki, Yamamoto Hajime, Patel Satyanarayan, Keil Peter, Koruza Jurij, Kawaguchi Shogo, Pan Zhao, Nishikubo Takumi, Roedel Juergen, Azuma Masaki

CHEMISTRY OF MATERIALS   31 ( 4 )   1352 - 1358   2019.2

Stability of Polar Structure in Filling-Controlled Giant Tetragonal Perovskite Oxide PbVO3 Reviewed

Hajime Yamamoto, Takahiro Ogata, Yuki Sakai, Masaki Azuma

Inorganic Chemistry   58 ( 4 )   2755 - 2760   2019.2

Hydrothermal Synthesis of Pyrochlore-Type Pentavalent Bismuthates Ca2Bi2O7 and Sr2Bi2O7 Reviewed

Md Saiduzzaman, Takahiro Takei, Sayaka Yanagida, Nobuhiro Kumada, Hena Das, Hirokazu Kyokane, Shogo Wakazaki, Masaki Azuma, Chikako Moriyoshi, Yoshihiro Kuroiwa

Inorganic Chemistry   58 ( 3 )   1759 - 1763   2019.2

Negative thermal expansion in electron doped PbVO3−x F x Reviewed

Takahiro Ogata, Kengo Oka, Masaki Azuma

Applied Physics Express   12 ( 2 )   2019.2

Enhanced tetragonality and large negative thermal expansion in a new Pb/Bi-based perovskite ferroelectric of (1 − x)PbTiO3–xBi(Zn1/2V1/2)O3

Zhao Pan, Jun Chen, Xingxing Jiang, Zheshuai Lin, Haibo Zhang, Yang Ren, Masaki Azuma, Xianran Xing

Inorganic Chemistry Frontiers   2019

Low dimensional antiferromagnetism in henmilite from the Fuka mine, Okayama prefecture

Yamamoto Hajime, Sakakura Terutoshi, Kabeya Noriyuki, Ochiai Akira, Azuma Masaki, Noda Yukio, Kimura Hiroyuki

Meeting Abstracts of the Physical Society of Japan   74.2   726 - 726   2019

Ionic conductivity of Pyrochlore-type Silver Tantalate and Fluorite-type Silver Niobate Reviewed

W. I, U. WITHANAGE, Nobuhiro Kumada, Takahiro Takei, Sayaka YANAGIDA, Kiyoharu Tadanaga, Akira Miura, Nataly Carolina, Rosero-Navarro, Masaki Azuma

J. Ceram. Soc. Jpn.   in press   2019

Ca2CuO2Cl2, a redetermination from single-crystal X-ray diffraction data

Benoît Baptiste, Masaki Azuma, Runze Yu, Paola Giura, Matteo d'Astuto

IUCrData   3 ( 11 )   2018.11

Na1/2Bi1/2VO3 and K1/2Bi1/2VO3: New Lead-Free Tetragonal Perovskites with Moderate c/a Ratios Reviewed

Hajime Yamamoto, Takahiro Ogata, Satyanarayan Patel, Jurij Koruza, Jürgen Rödel, Atanu Paul, Tanusri Saha-Dasgupta, Yuki Sakai, Mitsuru Itoh, Masaki Azuma

Chemistry of Materials   30 ( 19 )   6728 - 6736   2018.10

Development of Bismuth Ferrite as a Piezoelectric and Multiferroic Material by Cobalt Substitution Reviewed

Hojo Hajime, Oka Kengo, Shimizu Keisuke, Yamamoto Hajime, Kawabe Ryo, Azuma Masaki

ADVANCED MATERIALS   30 ( 33 )   2018.8

Extended operating temperature window of giant negative thermal expansion in Sn-doped Ca2RuO4 Reviewed

Takenaka K, Inoue N, Mizuno Y, Okamoto Y, Katayama N, Sakai Y, Nishikubo T, Azuma M

APPLIED PHYSICS LETTERS   113 ( 7 )   071902   2018.8

Colossal Negative Thermal Expansion in Electron-Doped PbVO3 Perovskites Reviewed

Hajime Yamamoto, Takashi Imai, Yuki Sakai, Masaki Azuma

Angewandte Chemie - International Edition   57 ( 27 )   8170 - 8173   2018.7

Formation of ZnO4 Tetrahedra and ZnO6 Octahedra in TeZnO3 Synthesized under High Pressure Reviewed

Jianhong Dai, Xudong Shen, Zhehong Liu, Qing Zhao, Xiao Wang, Cheng Dong, Yuecheng Bian, Wei Ding, Zhigao Sheng, Masaki Azuma, Youwen Long

Inorganic Chemistry   57 ( 11 )   6716 - 6721   2018.6

Optimized negative thermal expansion induced by gradual intermetallic charge transfer in Bi1-xSbxNiO3 Reviewed

Takumi Nishikubo, Yuki Sakai, Kengo Oka, Masaichiro Mizumaki, Tetsu Watanuki, Akihiko Machida, Naoyuki Maejima, Shigenori Ueda, Takashi Mizokawa, Masaki Azuma

Applied Physics Express   11 ( 6 )   2018.6

Large spontaneous polarization in polar perovskites of PbTiO3-Bi(Zn1/2Ti1/2)O3 Reviewed

Zhao Pan, Xingxing Jiang, Jun Chen, Lei Hu, Hajime Yamamoto, Linxing Zhang, Longlong Fan, Xi'An Fan, Yawei Li, Guangqiang Li, Yang Ren, Zheshuai Lin, Masaki Azuma, Xianran Xing

Inorganic Chemistry Frontiers   5 ( 6 )   1277 - 1281   2018.6

Room temperature ferromagnetism in BiFe1- xMnxO3 thin film induced by spin-structure manipulation Reviewed

Kei Shigematsu, Takeshi Asakura, Hajime Yamamoto, Keisuke Shimizu, Marin Katsumata, Haruki Shimizu, Yuki Sakai, Hajime Hojo, Ko Mibu, Masaki Azuma

Applied Physics Letters   112 ( 19 )   2018.5

鉛系ペロブスカイト型酸化物で「電荷ガラス」を発見

綿貫 徹, 町田 晃彦, Hyunjeong Kim, Runze Yu, 東 正樹, 水牧 仁一朗

放射光   31 ( 3 )   202 - 211   2018.5

Unusual inhomogeneous microstructures in charge glass state of PbCrO<inf>3</inf> Reviewed

Kosuke Kurushima, Hirofumi Tsukasaki, Takahiro Ogata, Yuki Sakai, Masaki Azuma, Yui Ishii, Shigeo Mori

Japanese Journal of Applied Physics   57 ( 5 )   2018.5

Systematic charge distribution changes in Bi- and Pb-3d transition metal perovskites Reviewed

Masaki Azuma, Yuki Sakai, Takumi Nishikubo, Masaichiro Mizumaki, Tetsu Watanuki, Takashi Mizokawa, Kengo Oka, Hajime Hojo, Makoto Naka

Dalton Transactions   47 ( 5 )   1371 - 1377   2018

Experimental and theoretical studies of the metallic conductivity in cubic PbVO3 under high pressure Reviewed

Kengo Oka, Touru Yamauchi, Sudipta Kanungo, Taku Shimazu, Katsuyohi Oh-ishi, Yoshiya Uwatoko, Masaki Azuma, Tanusri Saha-Dasgupta

Journal of the Physical Society of Japan   87 ( 2 )   2018

Metamagnetism stabilized giant magnetoelectric coupling in ferroelectric: X BaTiO3-(1 - X)BiCoO3 solid solution Reviewed

Lokanath Patra, Zhao Pan, Jun Chen, Masaki Azuma, P. Ravindran

Physical Chemistry Chemical Physics   20 ( 10 )   7021 - 7032   2018

Electric-Field-Induced Reorientation of the Magnetic Easy Plane in a Co-Substituted BiFeO3 Single Crystal Reviewed

Hajime Yamamoto, Yuki Sakai, Kei Shigematsu, Takuya Aoyama, Tsuyoshi Kimura, Masaki Azuma

Inorganic Chemistry   56 ( 24 )   15171 - 15177   2017.12

SPring-8での微細構造解析による負熱膨張材の電荷ガラス状態解明 Reviewed

東 正樹, 坂田 修身, 綿貫 徹

NanotechJapan Bulletin   10 ( 6 )   2017.12

Realization of Large Electric Polarization and Strong Magnetoelectric Coupling in BiMn3Cr4O12 Reviewed

Long Zhou, Jianhong Dai, Yisheng Chai, Huimin Zhang, Shuai Dong, Huibo Cao, Stuart Calder, Yunyu Yin, Xiao Wang, Xudong Shen, Zhehong Liu, Takashi Saito, Yuichi Shimakawa, Hajime Hojo, Yuichi Ikuhara, Masaki Azuma, Zhiwei Hu, Young Sun, Changqing Jin, Youwen Long

ADVANCED MATERIALS   29 ( 44 )   2017.11

Giant negative thermal expansion in Fe-doped layered ruthenate ceramics Reviewed

Koshi Takenaka, Tsubasa Shinoda, Naruhiro Inoue, Yoshihiko Okamoto, Naoyuki Katayama, Yuki Sakai, Takumi Nishikubo, Masaki Azuma

APPLIED PHYSICS EXPRESS   10 ( 11 )   2017.11

Colossal Volume Contraction in Strong Polar Perovskites of Pb(Ti,V)O-3 Reviewed

Zhao Pan, Jun Chen, Xingxing Jiang, Lei Hu, Runze Yu, Hajime Yamamoto, Takahiro Ogata, Yuichiro Hattori, Fangmin Guo, Xi'an Fan, Yawei Li, Guangqiang Li, Huazhi Gu, Yang Ren, Zheshuai Lin, Masaki Azuma, Xianran Xing

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   139 ( 42 )   14865 - 14868   2017.10

High-Pressure Synthesis of the Cobalt Pyrochlore Oxide Pb2Co2O7 with Large Cation Mixed Occupancy Reviewed

Junye Yang, Jianhong Dai, Zhehong Liu, Runze Yu, Hajime Hojo, Zhiwei Hu, Tunwen Pi, Yunhang Soo, Changqing Jin, Masaki Azuma, Youwen Long

INORGANIC CHEMISTRY   56 ( 19 )   11676 - 11680   2017.10

Ultrafast Control of the Polarity of BiCoO3 by Orbital Excitation as Investigated by Femtosecond Spectroscopy Reviewed

Y. Okimoto, S. Naruse, R. Fukaya, T. Ishikawa, S. Koshihara, K. Oka, M. Azuma, K. Tanaka, H. Hirori

Physical Review Applied   7 ( 6 )   2017.6

Resonant inelastic x-ray scattering study of spin-wave excitations in the cuprate parent compound Ca2CuO2Cl2 Reviewed

B. W. Lebert, M. P.M. Dean, A. Nicolaou, J. Pelliciari, M. Dantz, T. Schmitt, R. Yu, M. Azuma, J. P. Castellan, H. Miao, A. Gauzzi, B. Baptiste, M. D'Astuto

Physical Review B   95 ( 15 )   2017.4

Ferromagnetism at Room Temperature Induced by Spin Structure Change in BiFe1-xCoxO3 Thin Films Reviewed

Hajime Hojo, Ryo Kawabe, Keisuke Shimizu, Hajime Yamamoto, Ko Mibu, Kartik Samanta, Tanusri Saha-Dasgupta, Masaki Azuma

ADVANCED MATERIALS   29 ( 9 )   2017.3

Hydrothermal Synthesis, Structure, and Superconductivity of Simple Cubic Perovskite (Ba0.62K0.38)(Bi0.92Mg0.08)O-3 with T-c similar to 30 K Reviewed

Mirza H. K. Rubel, Takahiro Takei, Nobuhiro Kumada, M. Mozahar Ali, Akira Miura, Kiyoharu Tadanaga, Kengo Oka, Masaki Azuma, Eisuke Magome, Chikako Moriyoshi, Yoshihiro Kuroiwa

INORGANIC CHEMISTRY   56 ( 6 )   3174 - 3181   2017.3

A-Site and B-Site Charge Orderings in an s-d Level Controlled Perovskite Oxide PbCoO3 Reviewed

Yuki Sakai, Junye Yang, Runze Yu, Hajime Hojo, Ikuya Yamada, Ping Miao, Sanghyun Lee, Shuki Torii, Takashi Kamiyama, Marjana Lezaic, Gustav Bihlmayer, Masaichiro Mizumaki, Jun Komiyama, Takashi Mizokawa, Hajime Yamamoto, Takumi Nishikubo, Yuichiro Hattori, Kengo Oka, Yunyu Yin, Jianhong Dai, Wenmin Li, Shigenori Ueda, Akihisa Aimi, Daisuke Mori, Yoshiyuki Inaguma, Zhiwei Hu, Takayuki Uozumi, Changqing Jin, Youwen Long, Masaki Azuma

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   139 ( 12 )   4574 - 4581   2017.3

Hydrothermal synthesis and crystal structure of a new lithium copper bismuth oxide, LiCuBiO4 Reviewed

Nobuhiro Kumada, Ayumi Nakamura, Akira Miura, Takahiro Takei, Masaki Azuma, Hajime Yamamoto, Eisuke Magome, Chikako Moriyoshi, Yoshihiro Kuroiwa

JOURNAL OF SOLID STATE CHEMISTRY   245   30 - 33   2017.1

Structural analysis of charge glass-like state in PbCrO₃

Kurushima K., Ogata T., Azuma M., Ishii Y., Mori S.

Meeting Abstracts of the Physical Society of Japan   72.2   2304 - 2304   2017

Ultrafast Control of the Polarity of \textlessmath display="inline"\textgreater \textlessmrow\textgreater \textlessmsub\textgreater \textlessmrow\textgreater \textlessmi\textgreaterBiCoO\textless/mi\textgreater \textless/mrow\textgreater \textlessmrow\tex Reviewed

Okimoto Y, Naruse S, Fukaya R, Ishikawa T, Koshihara S, Oka K, Azuma M, Tanaka K, Hirori H

Phys. Rev. Appl.   7 ( 6 )   064016   2017

Giant Polarization and High Temperature Monoclinic Phase in a Lead-Free Perovskite of Bi(Zn0.5Ti0.5)O-3-BiFeO3 Reviewed

Zhao Pan, Jun Chen, Runze Yu, Hajime Yamamoto, Yangchun Rong, Lei Hu, Qiang Li, Kun Lin, Li You, Kun Zhao, Longlong Fan, Yang Ren, Kenichi Kato, Masaki Azuma, Xianran Xing

INORGANIC CHEMISTRY   55 ( 19 )   9513 - 9516   2016.10

Enhanced Piezoelectric Response due to Polarization Rotation in Cobalt-Substituted BiFeO3 Epitaxial Thin Films Reviewed

Keisuke Shimizu, Hajime Hojo, Yuichi Ikuhara, Masaki Azuma

ADVANCED MATERIALS   28 ( 39 )   8639 - 8644   2016.10

Investigation of colossal negative thermal expansion induced by intermetallic electron transfer transition using synchrotron radiation

岡研吾, 東正樹

放射光   29 ( 5 )   245‐252 - 252   2016.9

Glassy Distribution of Bi3+/Bi5+ in Bi1-xPbxNiO3 and Negative Thermal Expansion Induced by Intermetallic Charge Transfer Reviewed

Kiho Nakano, Kengo Oka, Tetsu Watanuki, Masaichiro Mizumaki, Akihiko Machida, Akane Agui, Hyunjeong Kim, Jun Komiyama, Takashi Mizokawa, Takumi Nishikubo, Yuichiro Hattori, Shigenori Ueda, Yuki Sakai, Masaki Azuma

CHEMISTRY OF MATERIALS   28 ( 17 )   6062 - 6067   2016.9

Temperature-Independent, Large Dielectric Constant Induced by Vacancy and Partial Anion Order in the Oxyfluoride Pyrochlore Pb2Ti2O6-delta F2 delta Reviewed

Kengo Oka, Hajime Hojo, Masaki Azuma, Katsuyoshi Oh-ishi

CHEMISTRY OF MATERIALS   28 ( 15 )   5554 - 5559   2016.8

Spin Structure Change in Co-Substituted BiFeO3 Reviewed

Hajime Yamamoto, Takumi Kihara, Kengo Oka, Masashi Tokunaga, Ko Mibu, Masaki Azuma

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   85 ( 6 )   2016.6

High-Temperature Monoclinic Cc Phase with Reduced c/a Ratio in Bi-based Perovskite Compound Bi2ZnTi1-xMnxO6 Reviewed

Runze Yu, Narumi Matsuda, Ken Tominaga, Keisuke Shimizu, Hajime Hojo, Yuki Sakai, Hajime Yamamoto, Kengo Oka, Masaki Azuma

INORGANIC CHEMISTRY   55 ( 12 )   6124 - 6129   2016.6

High-Pressure Polymorph of NaBiO3 Reviewed

Octavianti Naa, Nobuhiro Kumada, Akira Miura, Takahiro Takei, Masaki Azuma, Yoshihiro Kusano, Kengo Oka

INORGANIC CHEMISTRY   55 ( 12 )   5747 - 5749   2016.6

Hydrothermal Synthesis, Crystal Structure, and Superconductivity of a Double-Perovskite Bi Oxide Reviewed

Mirza H. K. Rubel, Takahiro Takei, Nobuhiro Kumada, M. Mozahar Ali, Akira Miura, Kiyoharu Tadanaga, Kengo Oka, Masaki Azuma, Masatomo Yashima, Kotaro Fujii, Eisuke Magome, Chikako Moriyoshi, Yoshihiro Kuroiwa, James R. Hester, Maxim Aydeev

CHEMISTRY OF MATERIALS   28 ( 2 )   459 - 465   2016.1

Controlling the property of negative thermal expansion in BiNiO₃ by elemental substitution

Hattori Y., Azuma M., Sakai Y., Mizokawa T., Mizimaki M., Ueda S.

Meeting Abstracts of the Physical Society of Japan   71   1796 - 1796   2016

Local structure of a charge-glass system, PbCrO3

Watanuki T., Kim H. J., Yu R., Machida A., Sakaki K., Nakamura Y., Mizumaki M., Hojo H., Azuma A.

Meeting Abstracts of the Physical Society of Japan   71   1982 - 1982   2016

High Field ESR measurements of Multiferroic compound BiFe_1-xCo_xO₃II

Morimitsu Arata, Okubo Susumu, Sakurai Takahiro, Hara Shigeo, Ohta Hitoshi, Yamamoto Hajime, Azuma Masaki

Meeting Abstracts of the Physical Society of Japan   71   1847 - 1847   2016

19pBM-10 Possible intermediate spin state as ground state in 1-xPbTiO_<3-x>BiCoO_3

Yamamoto Hajime, Pan Zhao, Chen Jun, Miyake Atsushi, Tokunaga Masashi, Matsuo Akira, Kindo Koichi, Azuma Masaki

Meeting Abstracts of the Physical Society of Japan   71   2028 - 2028   2016

Negative Thermal Expansion Compound BiNi_1-xFe_xO₃ and Zero-Thermal Expansion Composite

AZUMA Masaki

Journal of the Surface Finishing Society of Japan   67 ( 3 )   135 - 139   2016

A-site and B-site charge orderings of perovskite PbCoO3

Sakai Y., Yu R., Yamamoto H., Hojo H., Azuma M., Yamada I., Yang J., Yin Y., Long Y., Miao P., Lee S., Torii S., Kamiyama T.

Meeting Abstracts of the Physical Society of Japan   71   1799 - 1799   2016

Hard X-Ray Photoemission Spectroscopy of BiNiO₃ and Related Materials

Yamamoto Kent, Komiyama Jun, Sakai Yuki, Nishikubo Takumi, Hojo Hajime, Azuma Masaki, Oka Kengo, Mizumaki Masaichiro, Ueda Shigenori, Mizokawa Takashi

Meeting Abstracts of the Physical Society of Japan   71   1797 - 1797   2016

Local structure in charge glass-like state of PbCrO₃

Mori S., Kurushima K., Yoshimoto W., Ishii Y., Sakai Y., Hojyo H., Azuma M.

Meeting Abstracts of the Physical Society of Japan   71   1798 - 1798   2016

Melting of Pb Charge Glass and Simultaneous Pb-Cr Charge Transfer in PbCrO3 as the Origin of Volume Collapse Reviewed

Runze Yu, Hajime Hojo, Tetsu Watanuki, Masaichiro Mizumaki, Takashi Mizokawa, Kengo Oka, Hyunjeong Kim, Akihiko Machida, Kouji Sakaki, Yumiko Nakamura, Akane Agui, Daisuke Mori, Yoshiyuki Inaguma, Martin Schlipf, Konstantin Z. Rushchanskii, Marjana Lezaic, Masaaki Matsuda, Jie Ma, Stuart Calder, Masahiko Isobe, Yuichi Ikuhara, Masaki Azuma

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   137 ( 39 )   12719 - 12728   2015.10

A new LiNbO3-type polar oxide with closed-shell cations: ZnPbO3 Reviewed

Runze Yu, Hajime Hojo, Teruyasu Mizoguchi, Masaki Azuma

JOURNAL OF APPLIED PHYSICS   118 ( 9 )   2015.9

Observation of Magnetoelectric Multiferroicity in a Cubic Perovskite System: LaMn3Cr4O12 Reviewed

Xiao Wang, Yisheng Chai, Long Zhou, Huibo Cao, Clarina-dela Cruz, Junye Yang, Jianhong Dai, Yunyu Yin, Zhen Yuan, Sijia Zhang, Runze Yu, Masaki Azuma, Yuichi Shimakawa, Huimin Zhang, Shuai Dong, Young Sun, Changqing Jin, Youwen Long

PHYSICAL REVIEW LETTERS   115 ( 8 )   2015.8

Differences in local structure around Co and Fe of the BiCo1-xFexO3 system determined by x-ray absorption fine structure

N. Ishimatsu, T. Watanabe, K. Oka, M. Azuma, M. Mizumaki, K. Nitta, T. Ina, N. Kawamura

PHYSICAL REVIEW B   92 ( 5 )   p.054108   2015.8

Negative thermal expansion induced by intermetallic charge transfer Reviewed

Masaki Azuma, Kengo Oka, Koichiro Nabetani

SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS   16 ( 3 )   2015.6

Hydrothermal synthesis of a new Bi-based (Ba0.82K0.18)(Bi0.53Pb0.47)O-3 superconductor Reviewed

Mirza H. K. Rubel, Takahiro Takei, Nobuhiro Kumada, M. M. Ali, Akira Miura, Kiyoharu Tadanaga, K. Oka, M. Azuma, E. Magomae, C. Moriyoshi, Y. Kuroiwa

JOURNAL OF ALLOYS AND COMPOUNDS   634 ( 15 )   208 - 214   2015.6

Focus on advanced inorganic materials science: non-traditional concepts and approaches Foreword Reviewed

Mitsuru Itoh, Takashi Akatsu, Masaki Azuma, Keigo Kamata, Toshio Kamiya

SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS   16 ( 2 )   2015.4

New PbTiO3-Type Giant Tetragonal Compound Bi2ZnVO6 and Its Stability under Pressure Reviewed

Runze Yu, Hajime Hojo, Kengo Oka, Tetsu Watanuki, Akihiko Machida, Keisuke Shimizu, Kiho Nakano, Masaki Azuma

CHEMISTRY OF MATERIALS   27 ( 6 )   2012 - 2017   2015.3

Suppression of temperature hysteresis in negative thermal expansion compound BiNi1-xFexO3 and zero-thermal expansion composite Reviewed

Nabetani K, Muramatsu Y, Oka K, Nakano K, Hojo H, Mizumaki M, Agui A, Higo Y, Hayashi N, Takano M, Azuma M

APPLIED PHYSICS LETTERS   106 ( 6 )   2015.2

24aBF-10 Negative thermal expansion induced by intermetallic charge transfer in Sb substituted BiNiO_3

Nishikubo T., Nakano K., Oka K., Azuma M.

Meeting Abstracts of the Physical Society of Japan   70   2361 - 2361   2015

19aDB-2 Investigation of spin structure change in BiFe_<1-x>Co_xO_3 by means of Mossbauer spectroscopy and it's room-temperature ferromagnetism

Yamamoto Hajime, Mibu Ki, Azuma Masaki

Meeting Abstracts of the Physical Society of Japan   70   2087 - 2087   2015

19aPS-63 High Field ESR measurements of Multiferroic compound BiFe_<1-x>Co_xO_3

Morimitsu A., Okubo S., Sakurai T., Hara S., Ohta H., Yamamoto H., Azuma M.

Meeting Abstracts of the Physical Society of Japan   70   2155 - 2155   2015

19pDC-1 Crystal structure and valence state of new lead perovskite PbCoO_3

Sakai Y., Yu Runze, Hojo H., Azuma M., Murakami M., Yamada I., Yang Junye, Yin Yunyu, Long Youwen

Meeting Abstracts of the Physical Society of Japan   70   2206 - 2206   2015

19aCD-9 Anomalous phonon change in the pressure induced phase transition of BiNiO_3

Watanuki T., Fukuda T., Mizumaki M., Tsutsui S., Azuma M.

Meeting Abstracts of the Physical Society of Japan   70   2071 - 2071   2015

17pDB-6 Systematic Charge Distribution Changes in Pb Perovskites

Azuma Masaki

Meeting Abstracts of the Physical Society of Japan   70   1959 - 1960   2015

23pBE-2 Electronic Structure of PbVO_3 Studied by Photoemission Spectroscopy

Komiyama J., Ootsuki D., Mizokawa T., Mizumaki M., Runze Y., Oka K., Azuma M.

Meeting Abstracts of the Physical Society of Japan   70   2315 - 2315   2015

24aAD-8 Observation of the Spin Structure Change in Multiferroic BiFe_<1-x>Co_xO_3 Thin Films

Kawabe R., Hojo H., Yamamoto H., Shimizu K., Mibu K., Azuma M.

Meeting Abstracts of the Physical Society of Japan   70   1228 - 1228   2015

24aAD-7 Investigation of magnetoelectric effect in room temperature ferromagnetic ferroelectrics BiFe_<0.9>Co_<0.1>O_3

Yamamoto Hajime, Aoyama Takuya, Kimura Tsuyoshi, Azuma Masaki

Meeting Abstracts of the Physical Society of Japan   70   1227 - 1227   2015

Structural evolution and enhanced piezoresponse in cobalt-substituted BiFeO3 thin films Reviewed

Hajime Hojo, Ko Onuma, Yuichi Ikuhara, Masaki Azuma

APPLIED PHYSICS EXPRESS   7 ( 9 )   2014.9

Superconductivity in Noncentrosymmetric Iridium Silicide Li2IrSi3 Reviewed

Sunseng Pyon, Kazutaka Kudo, Jun-ichi Matsumura, Hiroyuki Ishii, Genta Matsuo, Minoru Nohara, Hajime Hojo, Kengo Oka, Masaki Azuma, V. Ovidiu Garlea, Katsuaki Kodama, Shin-ichi Shamoto

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   83 ( 9 )   2014.9

Absence of Metallic Conductivity in Tetragonal and Cubic PbVO3 at High Pressure Reviewed

Alexei A. Belik, Touru Yamauchi, Hiroaki Ueda, Yutaka Ueda, Hitoshi Yusa, Naohisa Hirao, Masaki Azuma

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   83 ( 7 )   2014.7

Direct phase-sensitive identification of a d-form factor density wave in underdoped cuprates Reviewed

Kazuhiro Fujita, Mohammad H. Hamidian, Stephen D. Edkins, Chung Koo Kim, Yuhki Kohsaka, Masaki Azuma, Mikio Takano, Hidenori Takagi, Hiroshi Eisaki, Shin-ichi Uchida, Andrea Allais, Michael J. Lawler, Eun-Ah Kim, Subir Sachdev, J. C. Seamus Davis

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA   111 ( 30 )   E3026 - E3032   2014.7

High-pressure synthesis of BaVO3: A new cubic perovskite Reviewed

Kousuke Nishimura, Ikuya Yamada, Kengo Oka, Yuichi Shimakawa, Masaki Azuma

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS   75 ( 6 )   710 - 712   2014.6

Superconducting Double Perovskite Bismuth Oxide Prepared by a Low-Temperature Hydrothermal Reaction Reviewed

Mirza H. K. Rubel, Akira Miura, Takahiro Takei, Nobuhiro Kumada, M. Mozahar Ali, Masanori Nagao, Satoshi Watauchi, Isao Tanaka, Kengo Oka, Masaki Azuma, Eisuke Magome, Chikako Moriyoshi, Yoshihiro Kuroiwa, A. K. M. Azharul Islam

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   53 ( 14 )   3599 - 3603   2014.4

High-pressure cell for neutron diffraction with in situ pressure control at cryogenic temperatures Reviewed

Matthew K. Jacobsen, Christopher J. Ridley, Artur Bocian, Oleg Kirichek, Pascal Manuel, Dmitry Khalyavin, Masaki Azuma, J. Paul Attfield, Konstantin V. Kamenev

REVIEW OF SCIENTIFIC INSTRUMENTS   85 ( 4 )   2014.4

緑色蛍光体(Ba3-x,Cax)Si6O12N2:Eu2+(x=0~0.75)の合成と光学特性評価 Reviewed

岩崎淳平, 片桐隆雄, 柳瀬侑起, 渡辺友亮, 笹川崇男, 東正樹, 小田原修, 和田裕之

2014.3

Five-dimensional visualization of phase transition in BiNiO3 under high pressure Reviewed

Yijin Liu, Junyue Wang, Masaki Azuma, Wendy L. Mao, Wenge Yang

APPLIED PHYSICS LETTERS   104 ( 4 )   2014.1

Suppression of Temperature Hysteresis of Negative Thermal Expansion Induced by Charge Transfer in BiNi&lt;sub&gt;1‐&lt;/sub&gt;&lt;sub&gt;x&lt;/sub&gt;Fe&lt;sub&gt;x&lt;/sub&gt;O&lt;sub&gt;3 &lt;/sub&gt;

奈部谷光一郎, 岡研吾, 東正樹

粉体および粉末冶金   61 ( 1 )   35-38 (J-STAGE)   2014

Crystal structure and electrical properties of (1 -x)BiFeO 3-xBiCoO3 thin films prepared by pulsed laser deposition Reviewed

Ko Onuma, Hajime Hojo, Yuichi Ikuhara, Masaki Azuma

Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   61 ( 1 )   44 - 49   2014

Preparation of epoxy resin/BiNiO3 composites with reduced thermal expansion

Yuya Muramatsu, Koichiro Nabetani, Kengo Oka, Masaki Azuma

Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   61 ( 1 )   39 - 43   2014

Suppression of temperature hysteresis of negative thermal expansion induced by charge transfer in BiNi1-xFexO3 Reviewed

Koichiro Nabetani, Kengo Oka, Masaki Azuma

Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   61 ( 1 )   35 - 38   2014

Spin Frustration from cis-Edge or -Corner Sharing Metal-Centered Octahedra Reviewed

Romain Gautier, Kengo Oka, Takumi Kihara, Nitesh Kumar, Athinarayanan Sundaresan, Masashi Tokunaga, Masaki Azuma, Kenneth R. Poeppelmeier

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   135 ( 51 )   19268 - 19274   2013.12

Crystal and magnetic structure in Co-substituted BiFeO3 Reviewed

Izabela Sosnowska, Masaki Azuma, Radosław Przeniosło, Dariusz Wardecki, Wei-Tin Chen, Kengo Oka, Yuichi Shimakawa

Inorganic Chemistry   52 ( 22 )   13269 - 13277   2013.11

Polarization Rotation in BiCo&lt;sub&gt;1-x&lt;/sub&gt;Fe&lt;sub&gt;x&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt;

岡研吾, 東正樹, 森茂生

日本結晶学会誌   55 ( 5 )   278 - 284   2013.10

Direct observation of negative thermal expansion in SrCu3Fe4O12 Reviewed

Ikuya Yamada, Kentaro Shiro, Kengo Oka, Masaki Azuma, Tetsuo Irifune

JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   121 ( 1418 )   912 - 914   2013.10

Effect of Oxygen Pressure on Electrical Properties of BiFe0.9Co0.1O3 Thin Films Prepared by Pulsed Laser Deposition Reviewed

Hajime Hojo, Ko Onuma, Yuichi Ikuhara, Masaki Azuma

JAPANESE JOURNAL OF APPLIED PHYSICS   52 ( 9 )   2013.9

Structure and Magnetic Properties of BiFe1-xCoxO3 and Bi0.9Sm0.1Fe1-xCoxO3 Reviewed

Makoto Kubota, Kengo Oka, Hisato Yabuta, Kaoru Miura, Masaki Azuma

INORGANIC CHEMISTRY   52 ( 18 )   10698 - 10704   2013.9

Tuning negative thermal expansion in Bi(1-x)Ln(x)NiO(3) (Ln = La, Nd, Eu, Dy) (vol 103, 061909, 2013) Reviewed

Kengo Oka, Koichiro Nabetani, Chika Sakaguchi, Hayato Seki, Michal Czapski, Yuichi Shimakawa, Masaki Azuma

APPLIED PHYSICS LETTERS   103 ( 9 )   2013.8

Enhanced ferromagnetic moment in Co-doped BiFeO3 thin films studied by soft x-ray circular dichroism Reviewed

V.R. Singh, V.K. Verma, K. Ishigami, G. Shibata, Y. Yamazaki, A. Fujimori, Y. Takeda, T. Okane, Y. Saitoh, H. Yamagami, Y. Nakamura, M. Azuma, Y. Shimakawa

J APPL PHYS   114 ( 10 )   103905-1 - 103905-6   2013.8

Tuning negative thermal expansion in Bi(1-x)Ln(x)NiO(3) (Ln = La, Nd, Eu, Dy) Reviewed

Kengo Oka, Koichiro Nabetani, Chika Sakaguchi, Hayato Seki, Michal Czapski, Yuichi Shimakawa, Masaki Azuma

APPLIED PHYSICS LETTERS   103 ( 6 )   2013.8

Intermetallic charge-transfer transition in Bi1-xLa xNiO3 as the origin of the colossal negative thermal expansion Reviewed

Kengo Oka, Masaichiro Mizumaki, Chika Sakaguchi, Alexandra Sinclair, Clemens Ritter, J. Paul Attfield, Masaki Azuma

Physical Review B - Condensed Matter and Materials Physics   88 ( 1 )   2013.7

Phonon anomalies and lattice dynamics in the superconducting oxychlorides Ca2-xCuO2Cl2

Matteo D'Astuto, Ikuya Yamada, Paola Giura, Lorenzo Paulatto, Andrea Gauzzi, Moritz Hoesch, Michael Krisch, Masaki Azuma, Mikio Takano

Physical Review B - Condensed Matter and Materials Physics   88 ( 1 )   2013.7

Phonon anomalies and lattice dynamics in the superconducting oxychlorides Ca2-xCuO2Cl2 Reviewed

d'Astuto, Matteo, Yamada, Ikuya, Giura, Paola, Paulatto, Lorenzo, Gauzzi, Andrea, Hoesch, Moritz, Krisch, Michael, Azuma, Masaki, Takano, Mikio

Physical Review B   88 ( 1 )   2013.7

Impact of Mn-O-O-Mn superexchange pathways in a honeycomb lattice Mn oxide with small charge-transfer energy Reviewed

H. Wadati, K. Kato, Y. Wakisaka, T. Sudayama, D. G. Hawthorn, T. Z. Regier, N. Onishi, M. Azuma, Y. Shimakawa, T. Mizokawa, A. Tanaka, G. A. Sawatzky

SOLID STATE COMMUNICATIONS   162   18 - 22   2013.5

Cu NQR and NMR Studies of Optimally Doped Ca2-xNaxCuO2Cl2 Reviewed

Yutaka Itoh, Takato Machi, Ikuya Yamada, Masaki Azuma, Mikio Takano

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   82 ( 5 )   2013.5

Intermetallic Charge Transfer and Colossal Negative Thermal Expansion in Perovskite BiNiO&lt;sub&gt;3&lt;/sub&gt;

東正樹, 岡研吾

日本結晶学会誌   54 ( 6 )   325 - 331   2012.12

Angle-dependent spectral weight transfer and evidence of a symmetry-broken in-plane charge response in Ca1.9Na0.1CuO2Cl2 Reviewed

R. Schuster, S. Pyon, M. Knupfer, M. Azuma, M. Takano, H. Takagi, B. Buechner

PHYSICAL REVIEW B   86 ( 24 )   2012.12

Dzyaloshinsky-Moriya interaction and field-induced magnetic order in an antiferromagnetic honeycomb lattice compound Bi3Mn4O12(NO3) studied by high-field electron spin resonance Reviewed

Susumu Okubo, Tomonari Ueda, Hitoshi Ohta, Weimin Zhang, Takahiro Sakurai, Nozomi Onishi, Masaki Azuma, Yuichi Shimakawa, Hiroki Nakano, Toru Sakai

PHYSICAL REVIEW B   86 ( 14 )   2012.10

Magnetic ground state of the frustrated honeycomb lattice antiferromagnet Bi 3Mn 4O 12(NO 3) Reviewed

N. Onishi, K. Oka, M. Azuma, Y. Shimakawa, Y. Motome, T. Taniguchi, M. Hiraishi, M. Miyazaki, T. Masuda, A. Koda, K. M. Kojima, R. Kadono

Physical Review B - Condensed Matter and Materials Physics   85 ( 18 )   2012.5

Sequential phase transitions in Sm substituted BiFeO3

Makoto Kubota, Kengo Oka, Yoshitaka Nakamura, Hisato Yabuta, Kaoru Miura, Yuichi Shimakawa, Masaki Azuma

Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   59 ( 5 )   239 - 245   2012.5

Magnetic ground state of the frustrated honeycomb lattice antiferromagnet Bi3Mn4O12(NO3) Reviewed

N. Onishi, K. Oka, M. Azuma, Y. Shimakawa, Y. Motome, T. Taniguchi, M. Hiraishi, M. Miyazaki, T. Masuda, A. Koda, K. M. Kojima, R. Kadono

PHYSICAL REVIEW B   85 ( 18 )   1 - 6   2012.5

Crystal Structural, Magnetic, and Transport Properties of Layered Cobalt Oxyfluorides, Sr2CoO3+xF1-x (0 &lt;= x &lt;= 0.15) Reviewed

Yoshihiro Tsujimoto, Clastin I. Sathish, Kun-Pyo Hong, Kengo Oka, Masaki Azuma, Yanfeng Guo, Yoshitaka Matsushita, Kazunari Yamaura, Eiji Takayama-Muromachi

INORGANIC CHEMISTRY   51 ( 8 )   4802 - 4809   2012.4

Polarization Rotation in the Monoclinic Perovskite BiCo1-xFexO3 Reviewed

Kengo Oka, Tsukasa Koyama, Tomoatsu Ozaaki, Shigeo Mori, Yuichi Shimakawa, Masaki Azuma

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   51 ( 32 )   7977 - 7980   2012

Visualization of the emergence of the pseudogap state and the evolution to superconductivity in a lightly hole-doped Mott insulator Reviewed

Kohsaka, Y., Hanaguri, T., Azuma, M., Takano, M., Davis, J. C., Takagi, H.

Nature Physics   8 ( 7 )   534 - 538   2012

Polarization Rotation in the Monoclinic Perovskite BiCo1-xFexO3 (vol 51, pg 7977, 2012) Reviewed

K. Oka, T. Koyama, T. Ozaaki, S. Mori, Y. Shimakawa, M. Azuma

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   51 ( 42 )   CP55 - CP55   2012

IONOTHERMAL SYNTHESIS A new spin on frustration Reviewed

Kenneth R. Poeppelmeier, Masaki Azuma

NATURE CHEMISTRY   3 ( 10 )   758 - 759   2011.10

Magnetic order, transport and infrared optical properties in the ACrO 3 system (A = Ca, Sr, and Pb) Reviewed

A. C. Komarek, T. Möller, M. Isobe, Y. Drees, H. Ulbrich, M. Azuma, M. T. Fernández-Díaz, A. Senyshyn, M. Hoelzel, G. André, Y. Ueda, M. Grüninger, M. Braden

Physical Review B - Condensed Matter and Materials Physics   84 ( 12 )   2011.9

Sequential Phase Transitions in Sm Substituted BiFeO3 Reviewed

Makoto Kubota, Kengo Oka, Yoshitaka Nakamura, Hisato Yabuta, Kaoru Miura, Yuichi Shimakawa, Masaki Azuma

JAPANESE JOURNAL OF APPLIED PHYSICS   50 ( 9 )   2011.9

Structural Transformation of Hexagonal (0001)BaTiO3 Ceramics to Tetragonal (111)BaTiO3 Ceramics Reviewed

Takayuki Watanabe, Mikio Shimada, Toshiaki Aiba, Hisato Yabuta, Kaoru Miura, Kengo Oka, Masaki Azuma, Satoshi Wada, Nobuhiro Kumada

JAPANESE JOURNAL OF APPLIED PHYSICS   50 ( 9 )   2011.9

Colossal negative thermal expansion in BiNiO3 induced by intermetallic charge transfer Reviewed

Masaki Azuma, Wei-tin Chen, Hayato Seki, Michal Czapski, Smirnova Olga, Kengo Oka, Masaichiro Mizumaki, Tetsu Watanuki, Naoki Ishimatsu, Naomi Kawamura, Shintaro Ishiwata, Matthew G. Tucker, Yuichi Shimakawa, J. Paul Attfield

NATURE COMMUNICATIONS   2   2011.6

Co-O-O-Co superexchange pathways enhanced by small charge-transfer energy in multiferroic BiCoO3 Reviewed

T. Sudayama, Y. Wakisaka, T. Mizokawa, H. Wadati, G. A. Sawatzky, D. G. Hawthorn, T. Z. Regier, K. Oka, M. Azuma, Y. Shimakawa

PHYSICAL REVIEW B   83 ( 23 )   2011.6

Enhanced Piezoelectric Constant of (1-x)BiFeO3-xBiCoO(3) Thin Films Grown on LaAlO3 Substrate Reviewed

Yoshitaka Nakamura, Masanori Kawai, Masaki Azuma, Makoto Kubota, Mikio Shimada, Toshiaki Aiba, Yuichi Shimakawa

JAPANESE JOURNAL OF APPLIED PHYSICS   50 ( 3 )   2011.3

Electronic and Structural Properties of ABO(3): Role of the B-O Coulomb Repulsions for Ferroelectricity Reviewed

Kaoru Miura, Masaki Azuma, Hiroshi Funakubo

MATERIALS   4 ( 1 )   260 - 273   2011.1

Multiferroic Compounds with Double-Perovskite Structures Reviewed

Yuichi Shimakawa, Masaki Azuma, Noriya Ichikawa

MATERIALS   4 ( 1 )   153 - 168   2011.1

Single Phase Formation and Electric Properties of Bismuth Niobium Based Perovskite-type Oxides Reviewed

Atsushi Shimamura, Ichiro Fujii, Nobuhiro Kumada, Kouichi Nakashima, Masaki Azuma, Yoshihiro Kuroiwa, Shinichiro Kawada, Masahiko Kimura, Satoshi Wada

ELECTROCERAMICS IN JAPAN XIV   485   81 - +   2011

Frustrated S=3/2 honeycomb antiferromagnet Bi3Mn4O12(NO3) Reviewed

M. Azuma, M. Matsuda, N. Onishi, S. Olga, Y. Kusano, M. Tokunaga, Y. Shimakawa, N. Kumada

INTERNATIONAL CONFERENCE ON FRUSTRATION IN CONDENSED MATTER (ICFCM)   320   2011

Morphology effects of Co3O4 nanocrystals catalyzing CO oxidation in a dry reactant gas stream Reviewed

Yonghong Teng, Yoshihiro Kusano, Masaki Azuma, Masatake Haruta, Yuichi Shimakawa

CATALYSIS SCIENCE & TECHNOLOGY   1 ( 6 )   920 - 922   2011

Preparation of Single Phase Bismuth Niobium Based Perovskite-type Oxides Reviewed

Atsushi Shimamura, Ichiro Fujii, Nobuhiro Kumada, Kouichi Nakashima, Masaki Azuma, Yoshihiro Kuroiwa, Satoshi Wada

3RD INTERNATIONAL CONGRESS ON CERAMICS (ICC3): ADVANCES IN ELECTRO CERAMICS   18   2011

Rhombohedral-tetragonal structural change and enhanced piezoelectric constant in (1-x)BiFeO3-xBiCoO(3) thin films Reviewed

Yoshitaka Nakamura, Masanori Kawai, Masaki Azuma, Makoto Kubota, Mikio Shimada, Toshiaki Aiba, Yuichi Shimakawa

3RD INTERNATIONAL CONGRESS ON CERAMICS (ICC3): ADVANCES IN ELECTRO CERAMICS   18   2011

Spin gapped behavior of a frustrated delta chain compound euchroite Reviewed

Hikomitsu Kikuchi, Yutaka Fujii, Daisuke Takahashi, Masaki Azuma, Yuichi Shimakawa, Toshifumi Taniguchi, Akira Matsuo, Koichi Kindo

INTERNATIONAL CONFERENCE ON FRUSTRATION IN CONDENSED MATTER (ICFCM)   320   2011

Disordered Ground State and Magnetic Field-Induced Long-Range Order in an S=3/2 Antiferromagnetic Honeycomb Lattice Compound Bi3Mn4O12(NO3) Reviewed

M. Matsuda, M. Azuma, M. Tokunaga, Y. Shimakawa, N. Kumada

PHYSICAL REVIEW LETTERS   105 ( 18 )   2010.10

Synthesis, structure, and physical properties of a -site ordered perovskites a Cu3Co4O12 (A = Ca and Y) Reviewed

Ikuya Yamada, Shintaro Ishiwata, Ichiro Terasaki, Masaki Azuma, Yuichi Shimakawa, Mikio Takano

Chemistry of Materials   22 ( 18 )   5328 - 5332   2010.9

Effect Of Films Thickness and Crystal Orientation on the Constituent Phase in Epitaxial BiFeO3-BiCoO3 Films Grown on SrTiO3 Substrates Reviewed

Shintaro YASUI, Keisuke YAZAWA, Tomoaki YAMADA, Ken NISHIDA, Hiroshi UCHIDA, Masaki AZUMA, Hiroshi FUNAKUBO

Japanese journal of applied physics   49 ( 9 )   09MB04-1 - 09MB04-5   2010.9

Pressure-Induced Spin-State Transition in BiCoO3 Reviewed

Kengo Oka, Masaki Azuma, Wei-tin Chen, Hitoshi Yusa, Alexei A. Belik, Eiji Takayama-Muromachi, Masaichiro Mizumaki, Naoki Ishimatsu, Nozomu Hiraoka, Masahiko Tsujimoto, Matthew G. Tucker, J. Paul Attfield, Yuichi Shimakawa

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   132 ( 27 )   9438 - 9443   2010.7

High-Field Study of Strong Magnetoelectric Coupling in Single-Domain Crystals of BiFeO3 Reviewed

Masashi Tokunaga, Masaki Azuma, Yuichi Shimakawa

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   79 ( 6 )   2010.6

Multiple pre-edge structures in Cu K-edge x-ray absorption spectra of high-T-c cuprates revealed by high-resolution x-ray absorption spectroscopy

C. Gougoussis, J. -P. Rueff, M. Calandra, M. d&apos;Astuto, I. Jarrige, H. Ishii, A. Shukla, I. Yamada, M. Azuma, M. Takano

PHYSICAL REVIEW B   81 ( 22 )   1 - 224519   2010.6

Crystal Structures and Electric Properties of (1-x)BiFeO3-xBiCoO(3) Thin Films Prepared by Chemical Solution Deposition Reviewed

Yoshitaka Nakamura, Masanori Kawai, Masaki Azuma, Yuichi Shimakawa

JAPANESE JOURNAL OF APPLIED PHYSICS   49 ( 5 )   2010.5

Single crystal growth and structure of La4Cu3MoO12 Reviewed

James A. Enterkin, Paul A. Maggard, Shintaro Ishiwata, Laurence D. Marks, Kenneth R. Poeppelmeier, Masaki Azuma, Mikio Takano

JOURNAL OF SOLID STATE CHEMISTRY   183 ( 3 )   551 - 556   2010.3

One-pot hydrothermal synthesis of uniformly cubic Co3O4 nanocrystals Reviewed

Yonghong Teng, Shinpei Yamamoto, Yoshihiro Kusano, Masaki Azuma, Yuichi Shimakawa

MATERIALS LETTERS   64 ( 3 )   239 - 242   2010.2

Electronic, Structural, and Piezoelectric Properties of BiFe1-xCoxO3 Reviewed

Kaoru Miura, Makoto Kubota, Masaki Azuma, Hiroshi Funakubo

JAPANESE JOURNAL OF APPLIED PHYSICS   49 ( 9 )   2010

Effect of Film Thickness and Crystal Orientation on the Constituent Phase in Epitaxial BiFeO3-BiCoO3 Films Grown on SrTiO3 Substrates Reviewed

Shintaro Yasui, Keisuke Yazawa, Tomoaki Yamada, Ken Nishida, Hiroshi Uchida, Masaki Azuma, Hiroshi Funakubo

JAPANESE JOURNAL OF APPLIED PHYSICS   49 ( 9 )   2010

High-field ESR measurements of S=3/2 honeycomb lattice antiferromagnet Bi3Mn4O12(NO3) Reviewed

Susumu Okubo, Fatma Elmasry, Weimin Zhang, Masashi Fujisawa, Takahiro Sakurai, Hitoshi Ohta, Masaki Azuma, Olga A. Sumirnova, Nobuhiro Kumada

INTERNATIONAL CONFERENCE ON MAGNETISM (ICM 2009)   200   2010

High-field study of multiferroic BiFeO(3) Reviewed

M. Tokunaga, M. Azuma, Y. Shimakawa

INTERNATIONAL CONFERENCE ON MAGNETISM (ICM 2009)   200   2010

Direct observation of the pressure-induced charge redistribution in BiNiO3 by x-ray absorption spectroscopy Reviewed

Masaichiro Mizumaki, Naoki Ishimatsu, Naomi Kawamura, Masaki Azuma, Yuichi Shimakawa, Mikio Takano, Takayuki Uozumi

PHYSICAL REVIEW B   80 ( 23 )   2009.12

Metallic versus insulating behavior in the A-site ordered perovskite oxides ACu(3)Co(4)O(12) (A = Ca and Y) controlled by Mott and Zhang-Rice physics Reviewed

Takashi Mizokawa, Yosuke Morita, Takaaki Sudayama, Kou Takubo, Ikuya Yamada, Masaki Azuma, Mikio Takano, Yuichi Shimakawa

PHYSICAL REVIEW B   80 ( 12 )   2009.9

Intermetallic Charge Transfer in A-Site-Ordered Double Perovskite BiCu3Fe4O12 Reviewed

Youwen Long, Takashi Saito, Takenori Tohyama, Kengo Oka, Masaki Azuma, Yuichi Shimakawa

INORGANIC CHEMISTRY   48 ( 17 )   8489 - 8492   2009.9

Electronic and Structural Properties of BiZn0.5Ti0.5O3 Reviewed

Kaoru Miura, Makoto Kubota, Masaki Azuma, Hiroshi Funakubo

JAPANESE JOURNAL OF APPLIED PHYSICS   48 ( 9 )   2009.9

First-principles study of defect-induced potentials in Ca2CuO2Cl2 Reviewed

Yu Kumagai, Fumiyasu Oba, Ikuya Yamada, Masaki Azuma, Isao Tanaka

PHYSICAL REVIEW B   80 ( 8 )   2009.8

Synthesis and Physical Properties of Double Perovskite Pb2FeReO6 Reviewed

Kousuke Nishimura, Masaki Azuma, Shigeto Hirai, Mikio Takano, Yuichi Shimakawa

INORGANIC CHEMISTRY   48 ( 13 )   5962 - 5966   2009.7

Synthesis, Crystal Structure, and Magnetic Properties of Bi3Mn4O12(NO3) Oxynitrate Comprising S=3/2 Honeycomb Lattice Reviewed

Olga Smirnova, Masaki Azuma, Nobuhiro Kumada, Yoshihiro Kusano, Masaaki Matsuda, Yuichi Shimakawa, Takahiro Takei, Yoshinori Yonesaki, Nobukazu Kinomura

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   131 ( 23 )   8313 - 8317   2009.6

Charge-transfer excitons in underdoped Ca2-xNaxCuO2Cl2 studied by electron energy-loss spectroscopy Reviewed

R. Schuster, S. Pyon, M. Knupfer, J. Fink, M. Azuma, M. Takano, H. Takagi, B. Buechner

PHYSICAL REVIEW B   79 ( 21 )   2009.6

Coherence factos in a high-T-c cuprate probed by quasi-particle scattering off vortices (vol 323, pg 923, 2009) Reviewed

T. Hanaguri, Y. Kohsaka, M. Ono, M. Maltseva, P. Coleman, Yamada, I, M. Azuma, M. Takano, K. Ohishi, H. Takagi

SCIENCE   324 ( 5926 )   465 - 465   2009.4

Effect of Zn substitution for Cu on Ca2-xNaxCuO2Cl2 near the hole concentration of 1/8 per Cu Reviewed

Kohki H. Satoh, Masatoshi Hiraishi, Masanori Miyazaki, Soshi Takeshita, Akihiro Koda, Ryosuke Kadono, Ikuya Yamada, Kengo Oka, Masaki Azuma, Yuichi Shimakawa, Mikio Takano

PHYSICA B-CONDENSED MATTER   404 ( 5-7 )   713 - 716   2009.4

Multiferroic oxides with double-perovskite structures Invited Reviewed

Materials integration   22 ( 3 )   9 - 16   2009.3

Temperature-induced A-B intersite charge transfer in an A-site-ordered LaCu3Fe4O12 perovskite Reviewed

Y. W. Long, N. Hayashi, T. Saito, M. Azuma, S. Muranaka, Y. Shimakawa

NATURE   458 ( 7234 )   60 - U3   2009.3

Pressure-Induced Transformation of 6H Hexagonal to 3C Perovskite Structure in PbMnO3 Reviewed

Kengo Oka, Masaki Azuma, Shigeto Hirai, Alexei A. Belik, Hiroshi Kojitani, Masaki Akaogi, Mikio Takano, Yuich Shimakawa

INORGANIC CHEMISTRY   48 ( 5 )   2285 - 2288   2009.3

Composition control and thickness dependence of {100}-oriented epitaxial BiCoO3-BiFeO3 films grown by metalorganic chemical vapor deposition Reviewed

Shintaro Yasui, Mitsumasa Nakajima, Hiroshi Naganuma, Soichiro Okamura, Ken Nishida, Takashi Yamamoto, Takashi Iijima, Masaki Azuma, Hitoshi Morioka, Keisuke Saito, Mutsuo Ishikawa, Tomoaki Yamada, Hiroshi Funakubo

JOURNAL OF APPLIED PHYSICS   105 ( 6 )   2009.3

Coherence Factors in a High-T-c Cuprate Probed by Quasi-Particle Scattering Off Vortices Reviewed

T. Hanaguri, Y. Kohsaka, M. Ono, M. Maltseva, P. Coleman, I. Yamada, M. Azuma, M. Takano, K. Ohishi, H. Takagi

SCIENCE   323 ( 5916 )   923 - 926   2009.2

Hydrothermal Synthesis of a New Double Perovskite-Type Bismuthate, (Ba0.75K0.14H0.11)BiO3 center dot nH(2)O Reviewed

Hong Jiang, Nobuhiro Kumada, Yoshinori Yonesaki, Takahiro Takei, Nobukazu Kinomura, Masatorno Yashima, Masaki Azuma, Kengo Oka, Yuichi Shimakawa

JAPANESE JOURNAL OF APPLIED PHYSICS   48 ( 1 )   2009.1

Synthesis of functional oxides using cubic anvil press -BiNiO 3 exhibiting inter-site charge transfer- Reviewed

Masaki Azuma, Shintaro Ishiwata, Yuichi Shimakawa, Mikio Takano

Review of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu   19 ( 4 )   241 - 247   2009

Fabrication of ZnO thin films by the photochemical deposition method Reviewed

Masaki Azuma, Masaya Ichimura

MATERIALS RESEARCH BULLETIN   43 ( 12 )   3537 - 3542   2008.12

Multiferroism at Room Temperature in BiFeO3/BiCrO3(111) Artificial Superlattices Reviewed

Noriya Ichikawa, Masaya Arai, Yusuke Imai, Kei Hagiwara, Hiroshi Sakama, Masaki Azuma, Yuichi Shimakawa, Mikio Takano, Yasutoshi Kotaka, Masashi Yonetani, Hironori Fujisawa, Masaru Shimizu, Kenya Ishikawa, Yasuo Cho

APPLIED PHYSICS EXPRESS   1 ( 10 )   2008.10

Rhombohedral-tetragonal phase boundary with high curie temperature in (1-x)BiCoO3-xBiFeO(3) solid solution Reviewed

Masaki Azuma, Seiji Niitaka, Naoaki Hayashi, Kengo Oka, Mikio Takano, Hiroshi Funakubo, Yuichi Shimakawa

JAPANESE JOURNAL OF APPLIED PHYSICS   47 ( 9 )   7579 - 7581   2008.9

Crystal structure and electrical properties of {100}-oriented epitaxial BiCoO3-BiFeO3 films grown by metalorganic chemical vapor deposition Reviewed

Shintaro Yasui, Hiroshi Naganuma, Soichiro Okamura, Ken Nishida, Takashi Yamamoto, Takashi Iijima, Masaki Azuma, Hitoshi Morioka, Keisuke Saito, Mutsuo Ishikawa, Tomoaki Yamada, Hiroshi Funakubo

JAPANESE JOURNAL OF APPLIED PHYSICS   47 ( 9 )   7582 - 7585   2008.9

Annealing temperature dependences of ferroelectric and magnetic properties in polycrystalline Co-substituted BiFeO3 films Reviewed

Hiroshi Naganuma, Jun Miura, Mitsumasa Nakajima, Hiromi Shima, Soichiro Okamura, Shintaro Yasui, Hiroshi Funakubo, Ken Nishida, Takashi Iijima, Masaki Azuma, Yasuo Ando, Kenji Kamishima, Koichi Kakizaki, Nobuyuki Hiratsuka

JAPANESE JOURNAL OF APPLIED PHYSICS   47 ( 9 )   7574 - 7578   2008.9

High field ESR measurements on one dimensional antiferromagnetic zigzag chain systems Reviewed

Hitoshi Ohta, Susumu Okubo, Kousuke Shiraki, Makoto Yoshida, Alexei A. Belik, Masaki Azuma, Mikio Takano

JOURNAL OF THE KOREAN PHYSICAL SOCIETY   53 ( 2 )   999 - 1005   2008.8

Magnetic ground-state of perovskite PbVO(3) with large tetragonal distortion Reviewed

Kengo Oka, Ikuya Yamada, Masaki Azuma, Soshi Takeshita, Kohki H. Satoh, Akihiro Koda, Ryosuke Kadono, Mikio Takano, Yuichi Shimakawa

INORGANIC CHEMISTRY   47 ( 16 )   7355 - 7359   2008.8

Structural and Physical Properties of Heavily Doped Yttrium Vanadate: Y0.6Cd0.4VO3 Reviewed

Alexei A. Belik, Masahiro Nagao, Masaki Azuma, Mikio Takano, Yoshio Matsui, Eiji Takayama-Muromachi

CHEMISTRY OF MATERIALS   20 ( 16 )   5246 - 5252   2008.8

Metallic behavior in A-site-ordered perovskites ACu(3)V(4)O(12) with A = Na+, Ca2+, and Y3+ Reviewed

Hiroshi Shiraki, Takashi Saito, Masaki Azuma, Yuichi Shimakawa

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   77 ( 6 )   2008.6

Charge and magnetic orderings in the triangular-lattice antiferromagnet InFe2O4 Reviewed

Kengo Oka, Masaki Azuma, Naaki Hayashi, Shigetoshi Muranaka, Yasuo Narumi, Koichi Kindo, Shinya Ayukawa, Masatsune Kato, Yoji Koike, Yuichi Shimakawa, Mikio Takano

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   77 ( 6 )   2008.6

High pressure synthesis and structure of a new magnetoplumbite-type cobalt oxide SrCo12O19 Reviewed

Shintaro Ishiwata, Ichiro Terasaki, Masaki Azuma, Mikio Takano

JOURNAL OF SOLID STATE CHEMISTRY   181 ( 5 )   1273 - 1278   2008.5

Neutron powder diffraction study of the crystal and magnetic structures of BiNiO(3) at low temperature Reviewed

Sandra J. E. Carlsson, Masaki Azuma, Yulchl Shimakawa, Miklo Takano, Alan Hewat, J. Paul Attfield

JOURNAL OF SOLID STATE CHEMISTRY   181 ( 3 )   611 - 615   2008.3

Ferromagnetic cuprates, CaCu3Ge4O12 and CaCu3Sn4O12, with A-site ordered perovskite structures Reviewed

Hiroshi Shiraki, Takashi Saito, Takahiro Yamada, Masahiko Tsujimoto, Masaki Azuma, Hiroki Kurata, Seiji Isoda, Mikio Takano, Yuichi Shimakawa

Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   55 ( 2 )   132 - 136   2008.2

Synthesis and physical properties of double perovskite Pb 2FeReO6 Reviewed

Kousuke Nishimura, Masaki Azuma, Mikio Takano, Yuichi Shimakawa

Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   55 ( 2 )   137 - 140   2008.2

A perovskite containing quadrivalent iron as a charge-disproportionated ferrimagnet Reviewed

Ikuya Yamada, Kazuhide Takata, Naoaki Hayashi, Satoshi Shinohara, Masaki Azuma, Shigeo Mori, Shigetoshi Muranaka, Yttichi Shimakawa, Mikio Takano

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   47 ( 37 )   7032 - 7035   2008

Magnetic and Mossbauer studies of 5% Fe-doped BiMnO3 Reviewed

Alexei A. Belik, Naoaki Hayashi, Masaki Azuma, Shigetoshi Muranaka, Mikio Takano, Eiji Takayama-Muromachi

JOURNAL OF SOLID STATE CHEMISTRY   180 ( 12 )   3401 - 3407   2007.12

Quasiparticle interference and superconducting gap in Ca 2-xNaxCuO2Cl2 Reviewed

T. Hanaguri, Y. Kohsaka, J. C. Davis, C. Lupien, I. Yamada, M. Azuma, M. Takano, K. Ohishi, M. Ono, H. Takagi

Nature Physics   3 ( 12 )   865 - 871   2007.12

Temperature-dependent photoemission and x-ray absorption studies of the metal-insulator transition in Bi1-x Lax Ni O3 Reviewed

Hiroki Wadati, Kiyohisa Tanaka, Atsushi Fujimori, Takashi Mizokawa, Hiroshi Kumigashira, Masaharu Oshima, Shintaro Ishiwata, Masaki Azuma, Mikio Takano

Physical Review B - Condensed Matter and Materials Physics   76 ( 20 )   2007.11

Pressure-induced intermetallic valence transition in BiNiO3 Reviewed

Masaki Azuma, Sandra Carlsson, Jennifer Rodgers, Matthew G. Tucker, Masahiko Tsujimoto, Shintaro Ishiwata, Seiji Isoda, Yuichi Shimakawa, Mikio Takano, J. Paul Attfield

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   129 ( 46 )   14433 - 14436   2007.11

Ferromagnetic cuprates CaCu(3)Ge(4)O(12) and CaCu(3)Sn(4)O(12) with A-site ordered perovskite structure Reviewed

H. Shiraki, T. Saito, T. Yamada, M. Tsujimoto, M. Azuma, H. Kurata, S. Isoda, M. Takano, Y. Shimakawa

PHYSICAL REVIEW B   76 ( 14 )   2007.10