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Magnetic-field-induced magnetic phase transitions associated with ferroelectricity in multiferroic ErMn$$_{2}$$O$$_{5}$$

マルチフェロイック物質ErMn$$_{2}$$O$$_{5}$$の強誘電性を伴う磁場誘起磁気相転移

木村 宏之*; 脇本 秀一  ; 福永 守*; 野田 幸男*; 金子 耕士   ; 目時 直人   ; 加倉井 和久; 近 桂一郎*

Kimura, Hiroyuki*; Wakimoto, Shuichi; Fukunaga, Mamoru*; Noda, Yukio*; Kaneko, Koji; Metoki, Naoto; Kakurai, Kazuhisa; Kay, Kohn*

Microscopic magnetic properties under the application of a magnetic field were investigated in multiferroic ErMn$$_{2}$$O$$_{5}$$ using neutron diffraction. Below $$T$$= 8K upon applying a magnetic field along the $$c$$-axis, an incommensurate-commensurate-incommensurate magnetic phase transition occurred. On the contrary, when the magnetic field was applied parallel to the $$a$$-axis, no phase transition occurred up to $$H$$= 5T. $$H$$-$$T$$ phase diagrams obtained in the present study show a one-to-one correspondence with $$H$$-$$T$$ phase diagrams for previously obtained dielectric properties, indicating that the field-induced dielectric transition was triggered by magnetic phase transition. The contrastive phase diagram between $$H$$$$c$$ and $$H$$$$a$$ suggests that the induced Er$$^{3+}$$ magnetic moment contributed significantly to the magnetic and dielectric responses to the magnetic field.

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パーセンタイル:37.27

分野:Physics, Multidisciplinary

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