"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?o<sup>3+</sup> as a trigger of weak ferromagnetism in Co-substituted BiFe?O<sub>3</sub>",,"Physical Review B",,"  110","  2","  024422",2025,July
"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","Pressure-Induced YbFe<sub>2</sub>O<sub>4</sub>-Type to Spinel Structural Change of InGaMgO<sub>4</sub>",,"Solids",,"vol. 5","no. 3","pp. 422-433",2024,Aug.
"¬’r „‘ε,Ό‹v•Ϋ  ,Žπˆδ —YŽχ,“Œ ³Žχ","K<sub>2</sub>NiF<sub>4</sub>Œ^‰»‡•¨Sr<sub>2</sub>CrO<sub>4</sub>ESr<sub>2</sub>CoO<sub>4</sub>‚̍‚ˆ³‡¬‚Ζ”M–c’£•]‰Ώ","‘ζ62‰ρƒZƒ‰ƒ~ƒbƒNƒXŠξ‘b‰ΘŠw“’˜_‰ο",,,,,,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,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","‘ζ15‰ρέ“ϊ‰Θ‹¦‡“―•ͺ‰Θ‰ο",,,,,,2024,
"¬’r „‘ε,Ό‹v•Ϋ  ,Žπˆδ —YŽχ,“Œ ³Žχ","K<sub>2</sub>NiF<sub>4</sub>Œ^‰»‡•¨Sr<sub>2</sub>CrO<sub>4</sub>ESr<sub>2</sub>CoO<sub>4</sub>‚̍‚ˆ³‡¬‚Ζ”M–c’£•]‰Ώ","‘ζ62‰ρƒZƒ‰ƒ~ƒbƒNƒXŠξ‘b‰ΘŠw“’˜_‰ο",,,,,,2024,
"ŽO‘ξ ,¬’r „‘ε,Ό‹v•Ϋ  ,Žπˆδ —YŽχ,“Œ ³Žχ","”ρ»ŽΏ‘O‹μ‘Μ‚π—p‚’‚½K<sub>2</sub>NiF<sub>4</sub>Œ^•‰”M–c’£ή—Ώ‚̍‡¬‚¨‚ζ‚Ρ’Tυ","•²‘Μ•²–––θ‹ΰ‹¦‰ο2023”N“xH‹G‘ε‰ο",,,,,,2023,
"Masayuki Fukuda,Hidenobu Murata,Takumi Nishikubo,Qiumin Liu,Koomok Lee,Takehiro Koike,Yuma Takahashi,Saori I. Kawaguchi,Naohisa Hirao,Hiroshi Funakubo,Masaki Azuma","Suppression of Pressure-Induced Phase Transitions in a Monoclinically Distorted LiNbO<sub>3</sub>-Type CuNbO<sub>3</sub> by Preference for a CuO<sub>3</sub> Triangular Coordination Environment",,"Inorganic Chemistry",,"  61","  32","  12719-12725",2022,Aug.
"Takehiro Koike,Takumi Nishikubo,Yuki Sakai,Hirofumi Ishii,Masaki Azuma","Negative thermal expansion in PbTiO<sub>3</sub>-type perovskites oxide Bi<sub>0.5+x</sub>Na<sub>0.5|x</sub>VO<sub>3</sub>",,"Journal of the Ceramic Society of Japan?",,"  130","  8","  691-695",2022,Aug.
"Shiori Kihara,Yuki Sakai,Shogo Wakazaki,Takumi Nishikubo,Takehiro Koike,Ko Mibu,Hongwu Yu,Yoichi Okimoto,Shin-ya Koshihara,Masaki Azuma","Bi<sub>0.5</sub>Pb<sub>0.5</sub>FeO<sub>3 </sub>with Unusual Pb Charge Disproportionation: Indication of a Systematic Charge Distribution Change in Bi<sub>0.5</sub>Pb<sub>0.5</sub>MO<sub>3 </sub>(M: 3d Transition Metal)",,"Inorganic Chemistry",,"  61","  32","  12822-12827",2022,Aug.
"Harry W. T. Morgan,Takafumi Yamamoto,Takumi Nishikubo,Takuya Ohmi,Takehiro Koike,Yuki Sakai,Masaki Azuma,Hirofumi Ishii,Genki Kobayashi,John E. McGrady","Sequential Pressure-Induced B1|B2 Transitions in the AnionOrdered Oxyhydride Ba<sub>2</sub>YHO<sub>3</sub>",,"Inorganic Chemistry",,"  61","  18","  7043-7050",2022,Apr.
"Zhao Pan,Koike Takehiro,Takumi Nishikubo,Lei Hu,Qiumin Liu,Yuki Sakai,Shogo Kawaguchi,Masaki Azuma","Realization of Negative Thermal Expansion in Lead-Free Bi<sub>0.5</sub>K<sub>0.5</sub>VO<sub>3 </sub>by the Suppression of Tetragonality",,"Inorganic Chemistry",,"  61","  8","  3730?3735",2022,Feb.
"¬’r „‘ε,“Œ ³Žχ,Ό‹v•Ϋ  ,Žπˆδ —YŽχ","PbTiO<sub>3</sub> Œ^ƒyƒƒuƒXƒJƒCƒgŽ_‰»•¨Bi<sub>0.5+x</sub>Na<sub>0.5-x</sub>VO<sub>3</sub>‚Μ•‰”M–c’£","•²‘Μ•²–––θ‹ΰt‹G‘ε‰ο",,,,,,2022,
"¬’r „‘ε,Ό‹v•Ϋ  ,Žπˆδ —YŽχ,“Œ ³Žχ","PbTiO<sub>3</sub> Œ^ƒyƒƒuƒXƒJƒCƒgŽ_‰»•¨Bi<sub>0.5+x</sub>Na<sub>0.5-x</sub>VO<sub>3</sub>‚Μ•‰”M–c’£","“ϊ–{ƒZƒ‰ƒ~ƒbƒNƒX‹¦‰ο‘ζ35‰ρH‹GƒVƒ“ƒ|ƒWƒEƒ€",,,,,,2022,