Mossbauer Spectroscopy of Ferroelectric YMn_2O_5(Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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We have investigated Mossbauer spectra of single crystal YMn_2O_5 (with 1.5 mol% ^<57>Fe), which is simultaneously ferroelectric (the ferroelectric Curie temperature T_<CE>=39 K and the second dielectric transition temperature T_<C2>=19 K) and antiferromagnetic (T_N=45 K) at low temperatures. In the temperature range of T_<C2><T<T_<CE>, the spectrum is composed of two different hyperfine sextets, indicating that the magnetic moments of Mn^<3+> ions are in two different states. A half of them are oriented parallel to the a-direction, which is probably the easy direction, while the other half are forced to be oriented along the bisector of the b- and c-direction. A few evidences indicate that both A and B moments rotate at T_<C2> to form an incommensurate helical spin structure with bunching. We present a remark on a possible relation between the ferroelectric transition and the magnetic long-range order in this oxide.
- 一般社団法人日本物理学会の論文
- 2005-01-15
著者
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Kohn Kay
Department Of Applied Physics School Of Science And Engineering Waseda University
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Kagomiya Isao
Advanced Research Center Of Science And Engineering Waseda University
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Tanaka Midori
Advanced Research Center Of Science And Engineering Waseda University
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NAKAMURA Shin
Advanced Research Center of Science and Engineering, Waseda University
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Matsumoto Satoshi
Department Of Agricultural Chemistry University Of Tokyo
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