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Emergent phenomena in perovskite-type manganites

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$$_3$$ and Sr$$_{1-x}$$Ba$$_x$$MnO$$_3$$ are discussed. In the YMnO$$_3$$, the ferroelectric lattice distortion associated with the $$E$$-type spin order is observed for the first time. Displacement-type ferroelectricity with off-center magnetic ions is discovered for Sr$$_{0.5}$$Ba$$_{0.5}$$MnO$$_3$$, which shows both large polarization value and strong coupling between ferroelectricity and magnetism.

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Category:Physics, Condensed Matter

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