論文

• L. Zhou, J. H. Dai, Y. S. Chai, H. M. Zhang, S. Dong, H. B. Cao, S. Calder, Y. Y. Yin, X. Wang, X. D. Shen, Z. H. Liu, T. Saito, Y. Shimakawa, H. Hojo, Y. Ikuhara, M. Azuma, Z. W. Hu, Y. Sun, C. Q. Jin, Y. W. Long. Realization of Large Electric Polarization and Strong Magnetoelectric Coupling in BiMn₃Cr₄O₁₂, Advanced Materials, Vol. 29, No. 44, p. 1703435, Nov. 2017.
• 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. Observation of Magnetoelectric Multiferroicity in a Cubic Perovskite System: LaMn₃Cr₄O₁₂, PHISICAL REVIEW LETTERS, Vol. 115, pp. 087601-1-6, Aug. 2015.
• Masayuki Toyoda, Takashi Saito, Kunihiko Yamauchi, Yuichi Shimakawa, Tamio Oguchi. Superexchange interaction in the A-site ordered perovskite YMn3Al4O12, Physical Review B, Vol. 92, July 2015.
• Takashi Saito, Masayuki Toyoda, C. Ritter, S. Zhang, Tamio Oguchi, J. P. Attfield, Yuichi Shimakawa. Symmetry-breaking 60 degree-spin order in the A-site-ordered perovskite LaMn3V4O12, Physical Review B, Vol. 90, Dec. 2014.
• Kousuke Nishimura, Ikuya Yamada, Kengo Oka, Yuichi Shimakawa, Masaki Azuma. High-pressure synthesis of BaVO3: A new cubic perovskite, JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, Vol. 75, No. 6, pp. 710-712, June 2014.
• Izabela Sosnowska, Masaki Azuma, Radosław Przeniosło, Dariusz Wardecki, Wei-tin Chen, Kengo Oka, Yuichi Shimakawa. Crystal and Magnetic Structure in Co-Substituted BiFeO₃, Inorganic Chemistry, Vol. 52, pp. 13269-13277, Nov. 2013.
• V. R. Singh, V. K. Verma, K. Ishigami, G. Shibata, Y. Yamazaki, A. Fujimori, Yukiharu Takeda, Tetsuo Okane, Yuji Saitoh, Hiroshi Yamagami, Y. Nakamura, M. Azuma, Y. Shimakawa. Enhanced ferromagnetic moment in Co-doped BiFeO₃ thin films studied by soft x-ray circular dichroism, JOURNAL OF APPLIED PHYSICS, Vol. 114, pp. 103905-1-6, Sept. 2013.
• Kengo Oka, Koichiro Nabetani, Chika Sakaguchi, Hayato Seki, Michel Czapski, Yuichi Shimakawa, Masaki Azuma. Tuning negative thermal expansion in Bi₁-_XLn_XNiO₃(Ln=La,Nd,Eu,Dy), APPLIED PHYSICS LETTERS, Vol. 103, pp. 061909-1-3, Aug. 2013.
• 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. Impact of Mn–O–O–Mn superexchange pathways in a honeycomb lattice Mn oxide with small charge-transfer energy, Solid State Communications, Vol. 162, pp. 18-22, June 2013.
• S. Okubo, Tomonari Ueda, H. Ohta, Weimin Zhang, T. Sakurai, Nozomi Onishi, Masaki Azuma, Yuichi Shimakawa, Hiroki Nakano, T. Sakai. Dzyaloshinsky-Moriya interaction and field-induced magnetic order in an antiferromagnetic honeycomb lattice compound Bi3Mn4O12(NO3) studied by high-field electron spin resonance, PHYSICAL REVIEW B, Vol. 86, No. 140401, pp. 1-4, Oct. 2012.
• Kengo Oka, Tsukasa koyama, Tomoatsu Ozaki, Yuichi Shimakawa, Masaki Azuma, Shigeo Mori. Polarization Rotation in the Monoclinic Perovskite BiCo1_xFex03, Angewandte Chemie-International Edition, Vol. 51, No. 32, pp. 7977-7980, Aug. 2012.
• 久保田 純, 岡 研吾, 中村 嘉孝, 薮田 久人, 三浦 薫, 島川 祐一, 東 正樹. Sm置換BiFeO₃の相転移挙動, 粉体および粉末冶金, Vol. 59, No. 5, pp. 239-245, May 2012.
• N. Onishi, K. Oka, M. Azuma, Y. Shimakawa, Yukitoshi Motome, Toshifumi Taniguchi, M. Hiraishi, M. Miyazaki, Tetsuya Masuda, A. Koda, R. Kadono, Kenji Kojima. Magnetic ground state of the frustrated honeycomb lattice antiferromagnet Bi3Mn4O12(NO3), PHYSICAL REVIEW B, Vol. 85, pp. 184412 1-6, May 2012.
• Yoshitaka Nakamura, M. Kawai, Masaki Azuma, Makoto Kubota, M. Shimada, Toshiaki Aiba, Yuichi Shimakawa. Rhombohedral-tetragonal structural change and enhanced piezoelectric constant in (1-x)BiFeO3-xBiCoO3 thin films, IOP Conf. Series: Materials Science and Engineering, Vol. 18, pp. 092017, Nov. 2011.
• Makoto Kubota, Kengo Oka, Yoshitaka Nakamura, Hisato Yabuta, Kaoru Miura, Yuichi Shimakawa, Masaki Azuma. Sequential Phase Transitions in Sm Substituted BiFeO3, Jpn. J. Appl. Phys., Vol. 50, No. 9, pp. 09NE08, Sept. 2011.
• 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. Colossal negative thermal expansion in BiNiO3 induced by intermetallic charge transfer, NATURE COMMUNICATIONS, Vol. 2, No. 347, pp. 1-5, June 2011.
• Sudayama, T, Y. Wakisaka, H. Wadati, Mizokawa, G. A. Sawatzky, D.G. Hawthorn, T. Z. Regier, Kengo Oka, Masaki Azuma, M. Shimakawa, Y. Co-O-O-Co superexchange pathways enhanced by small charge-transfer energy in multiferroic BiCoO(3), Pysical Review B, Vol. 83, pp. 235105-1-5, June 2011.
• Yoshitaka Nakamura, Masanori Kawai, Masaki Azuma, Makoto Kubota, M. Shimada, Toshiaki Aiba, Yuichi Shimakawa. Enhanced Piezoelectric Constant of (1- x)BiFeO3–xBiCoO3 Thin Films Grown on LaAIO3 Substrate, Jpn. J. Appl. Phys., Vol. 50, pp. 031505, Mar. 2011.
• M Azuma, Masaaki Matsuda, S Olga, Y Kusano, Y Shimakawa, N Kumada, Nozomi Onishi, M Tokunaga. Frustrated S=3/2 honeycomb antiferromagnet Bi3Mn4O12(NO3), Journal of Physics: Conference Series, Vol. 320, pp. 012005 1-7, 2011.
• 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. Pressure-Induced Spin-State Transition in BiCoO3, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, Vol. 132, No. 27, p. 9438, July 2010.
• Kengo Oka, Masaki Azuma, Alexei A. Belik, Hiroshi Kojitani, Masaki Akaogi, Mikio Takano, Yuichi Shimakawa. Pressure-Induced Transformation of 6H Hexagonal to 3C Perovskite Structure in PbMnO3, Inorganic Chemistry, Vol. 48, No. 5, pp. 2285, Mar. 2009.
• O. Smirnova, M. Azuma, N. Kumada, Y. Kusano, M. Matsuda, Y. Shimakawa, T. Takei, Y. Yonesaki, N. Kinomura. Synthesis, Crystal Structure and Magnetic Properties of Bi3Mn4O12(NO3) Oxynitrate Comprising S = 3/2 Honeycomb Lattice, J. Am. Chem. Soc., Vol. 131, pp. 8313-8317, 2009.
• K. Nishimura, M. Azuma, Shigeto Hirai, M. Takano, Y. Shimakawa. Synthesis and Physical Properties of Double Perovskite Pb2FeReO6,, Inorg. Chem., Vol. 48, pp. 5962-5966, 2009.
• Mizumaki, M., N. Ishimatsu, N. Kawamura, M. Azuma, Y. Shimakawa, M. Takano, Takayuki Uozumi. Direct observation of the pressure-induced charge redistribution in BiNiO3 by x-ray absorption spectroscopy., Phys. Rev. B,, Vol. 80, 125105-1-125105-4, 2009.
• Y. W. Long, N. Hayashi, T. Saito, M. Azuma, S. Muranaka, Y. Shimakawa. Temperature-induced A–B intersite charge transfer in an A-site-ordered LaCu3Fe4O12 perovskite, Nature, Vol. 458, pp. 60-63, 2009.
• H. Jiang, N. Kumada, Y. Yonesaki, T. Takei, N. Kinomura, M. Yashima, M. Azuma, K. Oka, Y. Shimakawa. Hydrothermal Synthesis of a New Double Perovskite-Type Bismuthate, (Ba0.75K0.14H0.11)BiO3•nH2O, Jpn. J. Appl. Phys., Vol. 48, pp. 010216-1-3, 2009.
• Mizokawa, T., Y. Morita, T. Sudayama, K. Takubo, I. Yamada, M. Azuma, M. Takano, Y. Shimakawa. Metallic versus insulating behavior in the A-site ordered perovskite oxides ACu3Co4O12 (A = Ca and Y) controlled by Mott and Zhang-Rice physics., Phys. Rev. B, Vol. 80, pp. 125105-1-125105-4, 2009.
• Long, Y.W., T. Saito, T. Tohyama, K. Oka, M. Azuma, Y. Shimakawa. Intermetallic Charge Transfer in A-Site-Ordered Double Perovskite BiCu3Fe4O12., Inog. Chem., Vol. 48, pp. 8489-8492, 2009.
• Kohki Satoh, Masatoshi Hiraishi, Masanori Miyazaki, Satoshi Takeshita, Akihiro Koda, R. Kadono, I. Yamada, K. Oka, M. Azuma, Y. Shimakawa, M. Takano. Effect of Zn substitution for Cu on Ca2-xNaxCuO2Cl2 near the hole concentration of 1/8 per Cu., Physica B-Condensed Matter, Vol. 404, pp. 713-716, 2009.
• Kengo Oka, Masaki Azuma, Ikuya Yamada, Soshi Takeshita, Kohki Satoh, Akihiro Koda, Ryosuke Kadono, Mikio Takano, Yuichi Shimakawa. Magnetic ground-state of perovskite PbVO3 with large tetragonal distortion, Inorganic Chemistry, Vol. 47, No. 16, pp. 7355, Aug. 2008.
• Kengo Oka, Masaki Azuma, Naoaki Hayashi, Shigetoshi Muranaka, Yasuo Narumi, Koichi Kindo, Masatsune Kato, Yoji Koike, Yuichi Shimakawa, Mikio Takano. Charge and magnetic orderings in the triangular-lattice antiferromagnet InFe2O4, Journal of the Physical Society of Japan, Vol. 77, No. 6, pp. 064803, June 2008.
• S. J. E. Carlsson, M. Azuma, Y. Shimakawa, M. Takano, A. Hewat, J. P. Attfield. Neutron powder diffraction study of the crystal and magnetic structures of BiNiO3 at low temperature., J. Solid State Chem., Vol. 181, pp. 611-615, 2008.
• I. Yamada, K. Takata, N. Hayashi, Shinohara Satoshi, M. Azuma, Shigeo Mori, S. Muranaka, Y. Shimakawa, M. Takano. A perovskite containing quadrivalent iron as a charge-disproportionated ferrimagnet., Angew. Chem. Int. Ed., Vol. 47, pp. 7032-7035, 2008.
• Hiroshi Shiraki, T. Saito, M. Azuma, Y. Shimakawa. Metallic behavior in A-site-ordered perovskites ACu3V4O12 with A = Na+, Ca2+, and Y3+., J. Phys. Soc. Jpn., Vol. 77, 064705, 2008.
• N. Ichikawa, M. Arai, Y. Imai, K. Hagiwara, H. Sakama, M. Azuma, Y. Shimakawa, M. Takano, Y. Kotaka, M. Yonetani, H. Fujisawa, M. Shimizu, K. Ishikawa, Y. Cho. Multiferroism at Room Temperature in BiFeO3/BiCrO3(111) Artificial Superlattices, Applied Physics Express, Vol. 1, pp. 101302, 2008.
• 白木 宏, 齊藤高志, 山田高広, 辻本将彦, 東 正樹, 倉田博基, 磯田正二, 高野幹夫, 島川祐一. Aサイトオーダーダブルペロブスカイト型構造を持つ強磁性銅酸化物CaCu3Ge4O12及びCaCu3Sn4O12, 粉体および粉末冶金, Vol. 55, No. 2, pp. 132-136, 2007.
• Y. Shimakawa, D. Kan, M. Kawai, M. Sakai, S. Inoue, M. Azuma, S. Kimura, O. Sakata. Direct observation of B-site ordering in multiferroic Bi2NiMnO6 thin film, Jpn. J. Appl. Phys.Part 2, Vol. 46, pp. L845-L847, 2007.
• K. Takata, I. Yamada, M. Azuma, M. Takano, Y. Shimakawa. Magnetoresistance and electronic structure of the half-metallic ferrimagnet BiCu3Mn4O12, Phys. Rev. B, Vol. 76, pp. 024429-1-024429-4, 2007.
• M. Azuma, Hirochika Kanda, A. A. Belik, Y. Shimakawa, M. Takano. Magnetic and Structural Properties of BiFe1-xMnxO3, J. Mag. Mag. Mater., Vol. 310, pp. 1177-1179, 2007.
• I. Yamada, M. Azuma, Y. Shimakawa, M. Takano. Single crystal growth of A-site deficient superconductor Ca2-xCuO2Cl2., Physica C, Vol. 460, pp. 420-421, 2007.
• H. Shiraki, T. Saito, Takahiro Yamada, M. Tsujimoto, M. Azuma, Hiroki Kurata, Syoji Isoda, M. Takano, Y. Shimakawa. Ferromagnetic cuprates CaCu3Ge4O12 and CaCu3Sn4O12 with A-site ordered perovskite structure, Phys. Rev. B, Vol. 76, pp. 140403/1-4., 2007.
• 岡研吾, 東正樹, 鳴海康雄, 金道浩一, 林直顕, 島川祐一, 高野幹夫. 三角格子反強磁性体InFe2O4の合成と物性, 粉体および粉末冶金, Vol. 54, No. 1, pp. 53-57, 2007.
• 河合正徳, 齊藤高志, 林直顕, 東正樹, 高野幹夫, 島川祐一. 高圧法を用いた層状化合物AFe6-xMnxO11 (A=Ba, Sr)の合成, 粉体および粉末冶金, Vol. 54, No. 1, pp. 58-63, 2007.
• 西村浩輔, 東 正樹, 高野幹夫, 島川祐一. ダブルペロブスカイトPb2FeReO6の合成と物性, 粉体および粉末冶金, Vol. 55, No. 2, pp. 137-140, 2007.
• M. Azuma, S. Niitaka, A. Belik, S. Ishiwata, T. Saito, K. Takata, I. Yamada, Y. Shimakawa, M. Takano. Magnetic Ferroelectrics Bi, Pb-3d Transition Metal Perovskites, Transactions of Materials Research Society of Japan, Vol. 31, No. 1, pp. 41-46, 2006.
• Atsunobu Masuno, Mitsutaka Haruta, M. Azuma, H. Kurata, S. Isoda, M. Takano, Y. Shimakawa. Epitaxial growth and B-site cation ordering in layered double perovskite La2CuSnO6 thin films, Appl. Phys. Lett., Vol. 89, pp. 211913-1-211913-3, 2006.
• A.A. Belik, Satoshi Iikubo, Katsuaki Kodama, Naoki Igawa, Shin-ichi Shamoto, Seiji Niitaka, M. Azuma, Y. Shimakawa, M. Takano, F. Izumi, E. Takayama-Muromachi. Neutron Powder Diffraction Study on the Crystal and Magnetic Structures of BiCoO3, Chem. Mater., Vol. 18, No. 3, pp. 798-803, 2006.
• Yamada, A.A. Belik, M. Azuma, Harjo S., T. Kamiyama, Y. Shimakawa, M. Takano. Single-Layer Oxychloride Superconductor Ca2-xCuO2Cl2 with A-Site Cation Deficiency, Phys. Rev. B, Vol. 72, No. 222, pp. 224503-1-224503-5, 2005.
• 高田和英, 東正樹, 島川祐一, 高野幹夫. 高圧合成法を用いた強磁性強誘電体ビスマスダブルペロブスカイトの探索, 粉体および粉末冶金, Vol. 52, No. 12, pp. 913-917, 2005.
• M. Azuma, Kazuhide Takata, T. Saito, S. Ishiwata, Y. Shimakawa, M. Takano. Designed Ferromagnetic, Ferroelectric Bi2NiMnO6, J. Am. Chem. Soc., Vol. 127, No. 24, Page 8889-8892, 2005.
• Alexei A. Belik, M. Azuma, T. Saito, Y. Shimakawa, M. Takano. Crystallographic Features and Tetragonal Phase Stability of PbVO3, a New Member of PbTiO3 Family, Chem. Mater., Vol. 17, No. 2, Page 269-273, 2005.

国内会議発表 (査読なし・不明)

• 森田 洋輔, 高野 幹夫, 須田山 貴亮, 田久保 耕, 溝川 貴司, 山田 幾也, 白木 宏, 齊藤 高志, 東 正樹, 島川 祐一. 24aPS-78 Aサイトダブルペロブスカイト(Ca,Na)Cu_3V4O_<12>の光電子分光(24aPS ポスターセッション(低温),領域8(強相関係:高温超伝導,強相関f電子系など)), 日本物理学会講演概要集, 一般社団法人 日本物理学会, Vol. 63, No. 0, 2008.
• 森田 洋輔, 須田山 貴亮, 田久保 耕, 溝川 貴司, 山田 幾也, 白木 宏, 東 正樹, 島川 祐一, 高野 幹夫. 22aWG-7 Aサイトダブルペロブスカイト(Ca,Y)Cu_3Co4O_<12>の光電子分光(Co酸化物,熱電材料,領域8,強相関係:高温超伝導,強相関f電子系など), 日本物理学会講演概要集, 一般社団法人 日本物理学会, Vol. 62, No. 0, 2007.

その他の論文・著書など

• 東 正樹, 島川 祐一, 水牧仁一朗, 綿貫 徹. ペロブスカイトBiNiO3におけるサイト間電荷移動と巨大負の熱膨張, SPring-8 Information, Vol. 16, No. 4, pp. 261-266, Nov. 2011.
• 東正樹, 岡研吾, 辻本将彦, 齊藤高志, 磯田正二, 島川祐一, 高野幹夫, 新高誠司, Alexei Belik. Bi, Pb-3d遷移金属ペロブスカイトの構造物性研究, 日本結晶学会誌, Vol. 49, No. 6, pp. 335-340, 2007.
• 東正樹, 齊藤高志, 山田幾也, 島川祐一, 高野幹夫. 放射光Ｘ線その場観察に基づく高圧相遷移金属酸化物の単結晶育成, 放射光, Vol. 19, No. 5, pp. 304-313, 2006.
• 東正樹, 高田和英, 齊藤高志, 山田幾也, 島川祐一, 高野幹夫. 機能性酸化物材料探索の新展開, 高圧力の科学と技術, Vol. 15, No. 4, pp. 292-302, 2005.

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