[15p-P3-1~32] 6.3 Oxide electronics

[15p-P3-6] Topotactic Synthesis of A-site Cation Ordered Perovskite YBaCo₂O₆ Epitaxial Thin Film, Exhibiting Huge Magnetic Anistropy and Spin State Transition

〇Tsukasa Katayama¹, Akira Chikamatsu², Yasushi Hirose^2,3, Makoto Minohara⁴, Hiroshi Kumigashira⁴, Isao Harayama⁵, Daiichiro Sekiba⁵, Tetsuya Hasegawa^2,3 (1.Tokyo Tech. MSL, 2.Univ. of Tokyo, 3.KAST, 4.KEK, 5.Univ. of Tsukuba)

Keywords:oxide thin film, cobaltite, ferromagnetism

Physical properties of A-site ordered perovskite cobaltites, RBaCo₂O_x, can be controlled over wide ranges by varying R and oxygen content, although the oxygen content range allowable in conventional high-temperature syntheses is limited. In this study, we succeessfully expanded the oxygen range by topotactic oxidation. The obtained new phase, YBaCo₂O₆, exhibited large crystal magnetic anisotropy and spin state transition.