Roles of Bond Alternation in Magnetic Phase Diagram of $R$MnO3
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概要
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In order to investigate the nature of the antiferromagnetic structures in perovskite $R$MnO3, we study a Heisenberg $J_{1}$–$J_{2}$ model with bond alternation using analytical and numerical approaches. The magnetic phase diagram which includes incommensurate spiral states and commensurate collinear states is reproduced. We discuss that the magnetic structure with spin $\uparrow\uparrow\downarrow\downarrow$ configuration (E-type structure) and the ferroelectricity emerge cooperatively to stabilize this phase. Magnetoelastic couplings are crucial to understand the magnetic and electric phase diagram of $R$MnO3.
- 2010-03-15
著者
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Furukawa Nobuo
Department Of Physics And Mathematics Aoyama Gakuin University
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Mochizuki Masahito
Department Of Manufacturing Science Graduate School Of Engineering Osaka University
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Furukawa Nobuo
Department of Physics and Mathematics, Aoyama Gakuin University, 5-10-1 Fuchinobe, Sagamihara, Kanagawa 229-8558, Japan
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Mochizuki Masahito
Department of Applied Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan
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