High-Temperature Multiferroic State of RBaCuFeO5 ($\text{R} = \text{Y}$, Lu, and Tm)
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概要
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Magnetic and/or dielectric/ferroelectric behaviors have been studied for YBaCuFeO5, LuBaCuFeO5, and TmBaCuFeO5, which are members of oxygen-deficient ordered perovskite systems RBaCuFeO5 (R = lanthanide Ln and other trivalent elements) and have two magnetic transitions. The magnetic structure of the high-temperature ($T$) ordered phase is basically antiferromagnetic, and in the low-$T$ ordered phase, a modulated magnetic component is superposed on the antiferromagnetic moments. The results of the pyrocurrent measurements indicate that electric polarization is induced in all these systems by the ordering to the modulated magnetic structure. For TmBaCuFeO5, the transition to this low-$T$ phase is found at a temperature as high as the melting point of ice.
- 2010-07-15
著者
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Satomi Erika
Department Of Physics Division Of Material Science Nagoya University
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Kakurai Kazuhisa
Quantum Beam Science Directorate Japan Atomic Energy Agency
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Kawamura Yuji
Department Of Chemical Engineering Hiroshima University
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Kobayashi Yoshiaki
Department Of Physics Division Of Material Science Nagoya University
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Sato Masatoshi
Department Of Agro-environmental Science Obihiro University Of Agriculture And Veterinary Medicine
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Yasui Yukio
Department Of Physics Division Of Material Science Nagoya University
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Yasui Yukio
Department of Physics, Division of Material Science, Nagoya University, Nagoya 464-8602, Japan
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Kai Takahiro
Department of Physics, Division of Material Science, Nagoya University, Nagoya 464-8602, Japan
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Kakurai Kazuhisa
Quantum Beam Science Directorate, Japan Atomic Energy, Tokai, Ibaraki 319-1195, Japan
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