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Spin-chirality-driven ferroelectricity on a perfect triangular lattice antiferromagnet

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.

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Category:Physics, Multidisciplinary

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