Emergent phenomena in perovskite-type manganites

ペロフスカイト型マンガン化合物の新物性

田口 康二郎*; 酒井 英明*; 奥山 大輔*; 石渡 晋太郎*; 藤岡 淳*; 福田 竜生  ; 橋爪 大輔*; 賀川 史敬*; 高橋 陽太郎*; 島野 亮*; 徳永 祐介*; 金子 良夫*; 中尾 朗子*; 中尾 裕則*; 村上 洋一*; 杉本 邦久*; 高田 昌樹*; 山内 邦彦*; Picozzi, S.*; Baron, A. Q. R.*; 有馬 孝尚*; 十倉 好紀*

Taguchi, Yasujiro*; Sakai, Hideaki*; Okuyama, Daisuke*; Ishiwata, Shintaro*; Fujioka, Jun*; Fukuda, Tatsuo; Hashizume, Daisuke*; Kagawa, Fumitaka*; Takahashi, Yoichiro*; Shimano, Ryo*; Tokunaga, Yusuke*; Kaneko, Yoshio*; Nakao, Akiko*; Nakao, Hironori*; Murakami, Yoichi*; Sugimoto, Kunihisa*; Takata, Masaki*; Yamauchi, Kunihiko*; Picozzi, S.*; Baron, A. Q. R.*; Arima, Takahisa*; Tokura, Yoshinori*

Perovskite-type manganites exhibit various interesting phenomena arising from complex interplay among spin, charge, orbital, and lattice degrees of freedom. As the respective examples, perovskite-type YMnO and SrBaMnO are discussed. In the YMnO, the ferroelectric lattice distortion associated with the -type spin order is observed for the first time. Displacement-type ferroelectricity with off-center magnetic ions is discovered for SrBaMnO, which shows both large polarization value and strong coupling between ferroelectricity and magnetism.