論文

• Koomok Lee, Hena Das, Yuki Sakai, Takumi Nishikubo, Kei Shigematsu, Daiki Ono, Takehiro Koike, Naomi Kawamura, Masaichiro Mizumaki, Naoki Ishimatsu, Masaki Azuma. High-spin C⁢o³⁺ as a trigger of weak ferromagnetism in Co-substituted BiFe⁢O₃, Physical Review B, 110, 2, 024422, July 2025.
• Wei-tin Chen, Takumi Nishikubo, Yuki Sakai, Hena Das, Masayuki Fukuda, Zhao Pan, Naoki Ishimatsu, Masaichiro Mizumaki, Naomi Kawamura, Saori I. Kawaguchi, Olga Smirnova, Mathew G. Tucker, Tetsu Watanuki, Akihiko Machida, Shigehiro Takajo, Yoshiya Uwatoko, Yuichi Shimakawa, Mikio Takano, Masaki Azuma, J. Paul Attfield. Pressure-induced charge amorphisation in BiNiO₃, Nature Communications, 16, 1, 2128, Mar. 2025.
• Tatsuya Yamaguchi, Mizuki Furo, Yuki Sakai, Takumi Nishikubo, Hajime Hojo, Masaki Azuma, Kengo Oka, Daisuke Mori, Yoshiyuki Inaguma, Kento Yamamoto, Jan Kuneš, Masaichiro Mizumaki, Takashi Mizokawa, Atsushi Hariki. Mechanism of intermetallic charge transfer and bond disproportionation in BiNiO₃ and PbNiO₃ revealed by hard x-ray photoemission spectroscopy, Physical Review B, 109, 205131, May 2024.
• Naoki Wada, Masaichiro Mizumaki, Yoshiki Seno, Yuta Kimura, Koji Amezawa, Masato Okada, Ichiro Akai, Toru Aonishi. Performance of Region-Based Markov Random Field with XY Spins, Journal of the Physical Society of Japan, Vol. 90, No. 4, Apr. 2021.
• Naoya Mamada, Masaichiro Mizumaki, Ichiro Akai, Toru Aonishi. Obtaining Underlying Parameters from Magnetic Domain Patterns with Machine Learning, Journal of the Physical Society of Japan, Vol. 90, No. 1, Jan. 2021.
• Hajime Yamamoto, Kaoru Toda, Yuki Sakai, Takumi Nishikubo, Ikuya Yamada, Kei Shigematsu, Masaki Azuma, Hajime Sagayama, Masaichiro Mizumaki, Kiyofumi Nitta, Hiroyuki Kimura. Emergence of a Cubic Phase Stabilized by Intermetallic Charge Transfer in (1 – x)PbVO₃–xBiCoO₃ Solid Solutions, CHEMISTRY OF MATERIALS, 32, 16, 6892-6897, July 2020.
• Takumi Nishikubo, Yuki Sakai, Kengo Oka, Masaichiro Mizumaki, Tetsu Watanuki, Akihiko Machida, Naoyuki Maejima, Shigenori Ueda, Takashi Mizokawa, Masaki Azuma. Optimized negative thermal expansion induced by gradual intermetallic charge transfer in Bi_1-xSb_xNiO₃, Applied physics express, Vol. 11, No. 6, p. 061102, June 2018.
• M. Azuma, Y. Sakai, T. Nishikubo, M. Mizumaki, T. Watanuki, T. Mizokawa, K. Oka, H. Hojo, M. Naka. Systematic charge distribution changes in Bi- and Pb-3d transition metal perovskites, Dalton Transactions, Vol. 47, No. 5, p. 1371-1377, Feb. 2018.
• Yuki Sakai, Junye Yang, Runze Yu, Hajime Hojo, Ikuya Yamada, Ping Miao, Sanghyun Lee, Shuki Torii, Takashi Kamiyama, Marjana Ležaić, G.Bihlmayer, M. Mizumaki, J.Komiyama, T.Mizokawa, H.Yamamoto, T.Nishikubo, Y.Hattori, K. Oka, Y.Yin, J.Dai, W.Li, S.Ueda, A.Aimi, D.Mori, Y. Inaguma, Z.Hu, T. Uozumi, C.Jin, Y.Long, Masaki Azuma. A-site and B-site charge orderings in an s-d level controlled perovskite oxide PbCoO₃, Journal of the American Chemical Society, Vol. 139, No. 12, pp. 4574-4581, Mar. 2017.
• Nakano Kiho, Oka Kengo, Watanuki Tetsu, Mizumaki Masaichiro, Machida Akihiko, Agui Akane, Kim Hyunjeong, Komiyama Jun, Mizokawa Takashi, Nishikubo Takumi, Masaki Azuma. Glassy Distribution of Bi3+/Bi5+ in Bi1–x Pb x NiO3 and Negative Thermal Expansion Induced by Intermetallic Charge Transfer, Chemistry of Materials, Vol. 28, No. 17, pp. 6062-6067, Aug. 2016.
• Runze Yu, Hajime Hojo, Tetsu Watanuki, Masaichiro Mizumaki, Takashi Mizokawa, Kengo Oka, Hyunjeong Kim, Akihiko Machida, Kouji Sakaki, Yumiko Nakamura, Aguin Akane, Daisuke Mori, Yoshiyuki Inaguma, Martin Schlipf, Konstantin Z. Rushchanskii, Marjana Lezaic, Masaaki Matsuda, Jie Ma, Stuart Calder, Masahiko Isobe, Yuichi Ikuhara, Masaki Azuma. Melting of Pb Charge Glass and Simultaneous Pb−Cr Charge Transfer in PbCrO₃ as the Origin of Volume Collapse, Journal of the American Chemical Society, Vol. 137, pp. 12719-12728, Sept. 2015.
• N. Ishimatsu, T. Watanabe, K. Oka, M. Azuma, M. Mizumaki, K. Nitta, T. Ina, N. Kawamura. Differences in local structure around Co and Fe of the BiCo₁−_x Fe_x O₃ system determined by x-ray absorption fine structure, PHYSICAL REVIEW B, Vol. 92, pp. 054108-1-9, 2015.
• K. Nabetani, Y. Muramatsu, K. Oka, Kiho Nakano, H. Hojo, M. Mizumaki, A. Agui, Y. Higo, N. Hayashi, M. Takano, M. Azuma. Suppression of temperature hysteresis in negative thermal expansion compound BiNi1− x Fe x O3 and zero-thermal expansion composite, APPLIED PHYSICS LETTERS, Vol. 106, pp. 061912, 2015.
• Hitoshi Fujii, Masayuki Toyoda, Hiroyoshi Momida, Masaichiro Mizumaki, Shigeru Kimura, Tamio Oguchi. Ab initio study of electronic, magnetic, and spectroscopic properties in A- and B-site-ordered perovskite CaCu3Fe2Sb2O12, Physical Review B, Vol. 90, July 2014.
• Kengo Oka, Masaichiro Mizumaki, Chika Sakaguchi, Alexandra Sinclair, Clemens Ritter, J. Paul Attfield, Masaki Azuma. Intermetallic charge-transfer transition in Bi₁−_xLa_xNiO₃ as the origin of the colossal negative thermal expansion, PHYSICAL REVIEW B, Vol. 88, July 2013.
• 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.
• 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.
• 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.

国際会議発表 (査読有り)

• 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. Domain Structure Observation and Design of Phase Transition-type Negative Thermal Expansion Materials, 15th International Symposium on Ferroic Domains & Micro- to Nano-scopic Structures (ISFD-15), 2022.

国内会議発表 (査読なし・不明)

• 侭⽥直也, ⽔牧仁⼀朗, ⾚井⼀郎, 青西亨. 磁性体薄膜上の磁区パターンのシミュレーションと素材パラメータの逆解析, 第34回日本放射光学会年会・放射光科学合同シンポジウム, Jan. 2021.
• 谷本寛樹, 水牧仁一朗, 妹尾 与志木, 赤井 一郎, 青西亨. リチウムイオン二次電池の2D-XASイメージの非負値行列因子分解, 電子情報通信学会ニューロコンピューティング研究会, 信学技報, Vol. 119, No. 453, pp. 113-118, Feb. 2020.

その他の論文・著書など

• 青西 亨, 谷本 寛樹, 徐 宏坤, 水牧 仁一朗, 妹尾 与志木, 内和田 純平, 山上 遼, 熊添 博之, 岩満 一功, 木村 勇太, 雨澤 浩史, 赤井 一郎. 非負値行列因子分解による2次元X線吸収スペクトルデータの解析, 日本神経回路学会誌 = The Brain & neural networks, Vol. 29, No. 1, p. 3-14, Mar. 2022.
• Masaki Azuma, Masaichiro Mizumaki, Toru Watanuki. Colossal negative thermal expansion in BiNiO₃ induced by intermetallic charge transfer, SPring-8 Research Frontiers 2011, pp. 52-53, Aug. 2012.
• 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.

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