論文

• Takehiro Koike, Hena Das, Kengo Oka, Yoshihiro Kusano, Fernando Cubillas, Francisco B. Bojorqez, Victor Emmanuel Alvarez-Montano, Shigekazu Ito, Kei Shigematsu, Hayato Togano, Ikuya Yamada, Hiroki Ishibashi, Kubota Yoshiki, Shigeo Mori, Noboru Kimizuka, Masaki Azuma. Pressure-Induced YbFe2O4-Type to Spinel Structural Change of InGaMgO4, Solids, vol. 5, no. 3, pp. 422-433, Aug. 2024.
• Qiu min 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 Azum. ressure Induced Amorphization of Pb²⁺ and Pb⁴⁺ in Perovskite PbFeO₃, Chemistry of Materials, 36, 1899-1907, Feb. 2024.
• Koomok Lee, Kei Shigematsu, Hena Das, Masaki Azuma. Exploring the correlation between the spin-state configuration and the magnetic order in Co-substituted BiFeO₃, Physical Review Materials, 6, 064401, June 2022.
• 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. High-Pressure Synthesis and Lithium-Ion Conduction of Li4OBr2 Derivatives with a Layered Inverse-Perovskite Structure, Chemistry of Materials 2021, 33, 23, Nov. 2021.
• 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. High-Pressure Synthesis and Lithium-Ion Conduction of Li₄OBr₂ Derivatives with a Layered Inverse-Perovskite Structure, Chemistry of Materials, 33, 23, 9194-9201, Nov. 2021.
• 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. Origin and Absence of Giant Negative Thermal Expansion in Reduced and Oxidized Ca₂RuO₄, Chemistry of Materials, 33, 19, Sept. 2021.
• 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. Observation of novel charge ordering and spin reorientation in perovskite oxide PbFeO3, Nature Communications, 12, 1917, Mar. 2021.
• 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. Observation of novel charge ordering and spin reorientation in perovskite oxide PbFeO3, Nature Communications, 12, 1917, Mar. 2021.
• Wakazaki Shogo, Nishikubo Takumi, Sakai Yuki, Shigematsu Kei, Das Hena, Zhang Depei, Zhang Qiang, Matsuda Masaaki, Azuma Masaki. Stabilized Charge, Spin, and Orbital Ordering by the 6s² Lone Pair in Bi_0.5Pb_0.5MnO₃, INORGANIC CHEMISTRY, 59, 18, 13390-13397, Sept. 2020.
• Md Saiduzzaman, Takahiro Takei, Sayaka Yanagida, Nobuhiro Kumada, Hena Das, Hirokazu Kyokane, Shogo Wakazaki, Masaki Azuma, Chikako Moriyoshi, Yoshihiro Kuroiwa. Hydrothermal Synthesis of Pyrochlore-Type Pentavalent Bismuthates Ca₂Bi₂O₇ and Sr₂Bi₂O₇, Inorganic Chemistry, Vol. 58, pp. 1759-1763, Jan. 2019.

国際会議発表 (査読有り)

• Yuki Sakai, Shiori Kihara, Shogo Wakazaki, Takumi Nishikubo, Masayuki Fukuda, Hena Das, Masaichiro Mizumaki, Ko Mibu, Akihiko Machida, Tetsu Watanuki, Masaki Azuma. Systematic charge distribution change in perovskite-type Bi_0.5Pb_0.5MO₃ (M = 3d transition metal), The 4th International Symposium on Negative Thermal Expansion and Related Materials (ISNTE-4), 2024.
• Hena Das, Masaki Azuma. Understanding the mechanisms responsible for the anisotropic thermal expansion in Ca₂RuO₄ ruthenates through quantum mechanical calculations, The 4th International Symposium on Negative Thermal Expansion and Related Materials (ISNTE-4), 2024.
• Koomok Lee, Kei Shigematsu, Das Hena, Masaki Azuma. Exploring the Correlation Between the Spin-State Configuration and the Magnetic Order in Co-Substituted BiFeO₃, 2022 MRS FALL MEETING, 2022.
• Koomok Lee, Keita Ozawa, Hena Das, Masaki Azuma. Theoretical investigations of the origin of canted ferromagnetism in Co doped BiFeO₃ multife, STAC12, 2021.

国内会議発表 (査読有り)

• Hena Das, Masaki Azuma. Anisotropic thermal expansion phenomena in Ca2RuO4 type systems, 日本セラミックス協会2024年年会, 2024.
• HENA DAS, Masaki Azuma. Mechanism of anisotropic thermal expansion phenomena in Ca₂RuO₄, 第62回セラミックス基礎科学討論会, 2024.
• Koomok Lee, Hena Das, Yuki Sakai, Takumi Nishikubo, Kei Shigematsu, Daiki Ono, Takehiro Koike, Naomi Kawamura, Masaichiro Mizumaki, Naoki Ishimatsu, Masaki Azuma. Emergence of weak ferromagnetism in High Spin Co³⁺ substituted BiFeO3, The 22nd Japan-Korea-Taiwan Symposium on Strongly Correlated Electron Systems (JKT22), 2024.
• Koomok Lee, Kei Shigematsu, Hena Das, Naomi Kawamura, Masaichiro Mizumaki, Naoki Ishimatsu, Masaki Azum. Emergence of weak ferromagnetism in High Spin Co³⁺ substituted BiFeO₃, Materials Research Society of Japan 2023/ the International Union of Materials Research Societies 2023 (MRM2023/IUMRS-ICA2023), 2024.
• 劉 丘民, 西久保 匠, 酒井 雄樹, Hena Das, 壬生 攻, 尾上 智子, 川上 隆輝, 町田 晃彦, 綿貫 徹, 東 正樹. PbFeO₃の圧力誘起相転移, 第64回高圧討論会, 2023.
• 劉 丘民, 西久保 匠, 酒井 雄樹, ヘナ ダス, 壬生 攻, 尾上 智子, 川上 隆照, 町田 晃彦, 綿貫 徹, 東 正樹. PbFeO₃の圧力誘起相転移, 日本セラミックス協会2023年年会, 2023.
• 西久保 匠, 若崎 翔吾, 山本 樹, 酒井 雄樹, DAS Hena, 町田 晃彦, 綿貫 徹, 東 正樹. Design and Domain Structure Observation of Phase Transition-type Negative Thermal Expansion Materials, 第32回日本MRS年次大会, 2022.
• 西久保匠, 若崎 翔吾, 山本 樹, 酒井 雄樹, DAS Hena, 町田 晃彦, 綿貫 徹, 東 正樹. ペロブスカイト PbMnO₃の局所構造と電荷秩序状態の解明, 日本セラミックス協会第35回秋季シンポジウム, 2022.
• 酒井 雄樹, 西久保 匠, ダス ヘナ, 東 正樹, 水牧 仁一郎, 溝川 貴司, 町田 晃彦, 綿貫 徹, 沖本 洋一. 放射光を用いたペロブスカイト型酸化物Bi_1-xPb_xNiO₃の負熱膨張メカニズムの解明, 日本セラミックス協会第35回秋季シンポジウム, 2022.

国内会議発表 (査読なし・不明)

• Koomok Lee, Hena Das, Yuki Sakai, Takumi Nishikubo, Kei Shigematsu, Daiki Ono, Takehiro Koike, Naomi Kawamura, Masaichiro Mizumaki, Naoki Ishimatsu, Masaki Azuma. Material Design for Low Power Consumption Multiferroic Memory using High Spin Co³⁺ substituted BiFeO3, 第15回在日科協合同分科会, 2024.
• Koomok Lee, Kei Shigematsu, Hena Das, Naomi Kawamura, Masaichiro Mizumaki, Naoki Ishimatsu, Masaki Azuma. Emergence of weak ferromagnetism in High Spin Co³⁺ substituted BiFeO₃, The 14th APCTP Workshop on Multiferroics, 2023.
• 西久保匠, 酒井雄樹, DAS Hena, 東正樹. ペロブスカイトPbMnO₃の電荷秩序状態の解明, 第64回高圧討論会, 2023.
• Koomok Lee, Hena Das, Kei Shigematsu, Masaki Azuma. Theoretical investigations of the canted antiferromagnetism in Co doped BiFeO₃, 応用物理学会, 2022.

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