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Role of magnetic chirality in polarization flip upon a commensurate-incommensurate magnetic phase transition in YMn$$_{2}$$O$$_{5}$$

YMn$$_{2}$$O$$_{5}$$の格子整合-非整合磁気転移で起こる分極反転における磁気カイラリティの役割

脇本 秀一; 木村 宏之*; 坂本 勇馬*; 福永 守*; 野田 幸男*; 武田 全康; 加倉井 和久

Wakimoto, Shuichi; Kimura, Hiroyuki*; Sakamoto, Yuma*; Fukunaga, Mamoru*; Noda, Yukio*; Takeda, Masayasu; Kakurai, Kazuhisa

We have performed simultaneous measurements of magnetic chirality by using polarized neutrons and electric polarization along the $$b$$-axis of single crystals of YMn$$^{4+}$$(Mn$$_{1-x}$$Ga$$_{x}$$)$$^{3+}$$O$$_{5}$$ with $$x=0.047$$ and $$0.12$$, in which nonmagnetic Ga-ions dilute Mn$$^{3+}$$ spins. Measurements conducted under zero field heating after various field-cooling conditions evidence that the magnetic chirality of Mn$$^{4+}$$ cycloidal spins plays a dominant role in the incommensurate magnetic (ICM) phase, whereas the magnetic exchange striction by the Mn$$^{4+}$$-Mn$$^{3+}$$ chain plays a dominant role in the commensurate magnetic (CM) phase. The polarization of YMn$$_{2}$$O$$_{5}$$ flips upon CM to ICM phase transition because the ferroelectricity driven by the magnetic chirality and the exchange striction provides opposite directions of polarization.

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パーセンタイル:33.19

分野:Materials Science, Multidisciplinary

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