Spin-chirality-driven ferroelectricity on a perfect triangular lattice antiferromagnet
三田村 裕幸*; 綿貫 竜太*; 金子 耕士; 小野崎 紀道*; 天羽 祐太*; 橘高 俊一郎*; 小林 理気*; 志村 恭通*; 山本 勲*; 鈴木 和也*; Chi, S.*; 榊原 俊郎*
Mitamura, Hiroyuki*; Watanuki, Ryuta*; Kaneko, Koji; Onozaki, Norimichi*; Amo, Yuta*; Kittaka, Shunichiro*; Kobayashi, Riki*; Shimura, Yasuyuki*; Yamamoto, Isao*; Suzuki, Kazuya*; Chi, S.*; Sakakibara, Toshiro*
Magnetic field ($$B$$) variation of the electrical polarization $$P$$$$_{c}$$ ($${parallel}$$c) of the perfect triangular lattice antiferromagnet RbFe (MoO$$_4$$)$$_2$$ is examined up to the saturation point of the magnetization for B$${perp}c$$. $$P$$$$_{c}$$ is observed only in phases for which chirality is predicted in the in-plane magnetic structures. No strong anomaly is observed in $$P$$$$_{c}$$ at the field at which the spin modulation along the c axis exhibits a discontinuity to the commensurate state. These results indicate that ferroelectricity in this compound originates predominantly from triangular-spin chirality. The obtained field-temperature phase diagrams of ferroelectricity well agree with those theoretically predicted for the spin chirality of a Heisenberg spin triangular lattice antiferromagnet.
使用言語 : English
掲載資料名 : Physical Review Letters
: 113
: 14
ページ数 : p.147202_1 - 147202_5
発行年月 : 2014/10
出版社名 : American Physical Society
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広報プレスリリース : 磁性体で「スピンカイラリティ」由来の強誘電性を立証(磁性と強誘電性を併せ持つ多機能性材料開発に新しい道筋)
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登録番号 : AA20140243
抄録集掲載番号 : 42001451
論文投稿番号 : 15077
Accesses  (From Jun. 2, 2014)
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