"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",2024,Aug.
"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 Pb<sup>2+</sup> and Pb<sup>4+</sup> in Perovskite PbFeO<sub>3</sub>",,"Chemistry of Materials",,"  36",,"  1899-1907",2024,Feb.
"Hena Das,Masaki Azuma","Anisotropic thermal expansion phenomena in Ca2RuO4 type systems","“ú–{ƒZƒ‰ƒ~ƒbƒNƒX‹¦‰ï2024”N”N‰ï",,,,,,2024,
"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<sub>0.5</sub>Pb<sub>0.5</sub>MO<sub>3 </sub>(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 Ca<sub>2</sub>RuO<sub>4</sub> ruthenates through quantum mechanical calculations","The 4th International Symposium on Negative Thermal Expansion and Related Materials (ISNTE-4)",,,,,,2024,
"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 Co<sup>3+</sup> substituted BiFeO3","‘æ15‰ñ�Ý“ú‰È‹¦�‡“¯•ª‰È‰ï",,,,,,2024,
"HENA DAS,Masaki Azuma","Mechanism of anisotropic thermal expansion phenomena in Ca<sub>2</sub>RuO<sub>4</sub>","‘æ62‰ñƒZƒ‰ƒ~ƒbƒNƒXŠî‘b‰ÈŠw“¢˜_‰ï",,,,,,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 Co<sup>3+</sup> 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 Co<sup>3+</sup> substituted BiFeO<sub>3</sub>","Materials Research Society of Japan 2023/ the International Union of Materials Research Societies 2023 (MRM2023/IUMRS-ICA2023)",,,,,,2024,
"Koomok Lee,Kei Shigematsu,Hena Das,Naomi Kawamura,Masaichiro Mizumaki,Naoki Ishimatsu,Masaki Azuma","Emergence of weak ferromagnetism in High Spin Co<sup>3+</sup> substituted BiFeO<sub>3</sub>","The 14th APCTP Workshop on Multiferroics",,,,,,2023,
"�¼‹v•Û� ,Žðˆä—YŽ÷,DAS Hena,“Œ�³Ž÷","ƒyƒ�ƒuƒXƒJƒCƒgPbMnO<sub>3</sub>‚Ì“d‰×’��˜�ó‘Ԃ̉ð–¾","‘æ64‰ñ�‚ˆ³“¢˜_‰ï",,,,,,2023,
"—« ‹u–¯,�¼‹v•Û � ,Žðˆä —YŽ÷,Hena Das,�p�¶ �U,”ö�ã ’qŽq,�ì�ã —²‹P,’¬“c �W•F,–ÈŠÑ “O,“Œ �³Ž÷","PbFeO<sub>3</sub>‚̈³—Í—U‹N‘Š“]ˆÚ","‘æ64‰ñ�‚ˆ³“¢˜_‰ï",,,,,,2023,
"—« ‹u–¯,�¼‹v•Û � ,Žðˆä —YŽ÷,ƒwƒi ƒ_ƒX,�p�¶ �U,”ö�ã ’qŽq,�ì�ã —²�Æ,’¬“c �W•F,–ÈŠÑ “O,“Œ �³Ž÷","PbFeO<sub>3</sub>‚̈³—Í—U‹N‘Š“]ˆÚ","“ú–{ƒZƒ‰ƒ~ƒbƒNƒX‹¦‰ï2023”N”N‰ï",,,,,,2023,
"Koomok Lee,Kei Shigematsu,Hena Das,Masaki Azuma","Exploring the correlation between the spin-state configuration and the magnetic order in Co-substituted BiFeO<sub>3</sub>",,"Physical Review Materials",,"  6",,"  064401",2022,June
"�¼‹v•Û � ,Žá�è ãÄŒá,ŽR–{ Ž÷,Žðˆä —YŽ÷,DAS Hena,’¬“c �W•F,–ÈŠÑ “O,“Œ �³Ž÷","Design and Domain Structure Observation of Phase Transition-type Negative Thermal Expansion Materials","‘æ32‰ñ“ú–{MRS”NŽŸ‘å‰ï",,,,,,2022,
"Koomok Lee,Hena Das,Kei Shigematsu,Masaki Azuma","Theoretical investigations of the canted antiferromagnetism in Co doped BiFeO<sub>3</sub>","‰ž—p•¨—�Šw‰ï",,,,,,2022,
"Koomok Lee,Kei Shigematsu,Das Hena,Masaki Azuma","Exploring the Correlation Between the Spin-State Configuration and the Magnetic Order in Co-Substituted BiFeO<sub>3</sub>","2022 MRS FALL MEETING",,,,,,2022,
"�¼‹v•Û� ,Žá�è ãÄŒá,ŽR–{ Ž÷,Žðˆä —YŽ÷,DAS Hena,’¬“c �W•F,–ÈŠÑ “O,“Œ �³Ž÷","ƒyƒ�ƒuƒXƒJƒCƒg PbMnO<sub>3</sub>‚Ì‹Ç�Š�\‘¢‚Æ“d‰×’��˜�ó‘Ԃ̉ð–¾","“ú–{ƒZƒ‰ƒ~ƒbƒNƒX‹¦‰ï‘æ35‰ñ�H‹GƒVƒ“ƒ|ƒWƒEƒ€",,,,,,2022,
"Žðˆä —YŽ÷,�¼‹v•Û � ,ƒ_ƒX ƒwƒi,“Œ �³Ž÷,�…–q �mˆê˜Y,�a�ì ‹MŽi,’¬“c �W•F,–ÈŠÑ “O,‰«–{ —mˆê","•úŽËŒõ‚ð—p‚¢‚½ƒyƒ�ƒuƒXƒJƒCƒgŒ^Ž_‰»•¨Bi<sub>1-x</sub>Pb<sub>x</sub>NiO<sub>3</sub>‚Ì•‰”M–c’£ƒ�ƒJƒjƒYƒ€‚̉ð–¾","“ú–{ƒZƒ‰ƒ~ƒbƒNƒX‹¦‰ï‘æ35‰ñ�H‹GƒVƒ“ƒ|ƒWƒEƒ€",,,,,,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",,,,,2021,Nov.
"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 Li<sub>4</sub>OBr<sub>2</sub> Derivatives with a Layered Inverse-Perovskite Structure",,"Chemistry of Materials",,"  33","  23","  9194-9201",2021,Nov.
"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 Ca<sub>2</sub>RuO<sub>4</sub>",,"Chemistry of Materials",,"  33","  19",,2021,Sept.
"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",2021,Mar.
"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",2021,Mar.
"Koomok Lee,Keita Ozawa,Hena Das,Masaki Azuma","Theoretical investigations of the origin of canted ferromagnetism in Co doped BiFeO<sub>3</sub> multife","STAC12",,,,,,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 6s<sup>2</sup> Lone Pair in Bi<sub>0.5</sub>Pb<sub>0.5</sub>MnO<sub>3</sub>",,"INORGANIC CHEMISTRY",,"  59","  18","  13390-13397",2020,Sept.
"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 Ca<sub>2</sub>Bi<sub>2</sub>O<sub>7</sub> and Sr<sub>2</sub>Bi<sub>2</sub>O<sub>7</sub>",,"Inorganic Chemistry",,"Vol. 58",,"pp. 1759-1763",2019,Jan.