Phase Diagram of Lattice-Spin System RbCoBr_3(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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We study the lattice-spin model of RbCoBr_3 which is proposed by Shirahata and Nakamura, by mean field approximation. This model is an Ising spin system on a distorted triangular lattice. There are two kinds of frustrated variables, that is, the lattice and spin. We obtain a phase diagram of which phase boundary is drawn continuously in a whole region. Intermediate phases that include a partial disordered state appear. The model has the first-order phase transitions in addition to the second-order phase transitions. We find a three-sublattice ferrimagnetic state in the phase diagram. The three-sublattice ferrimagnetic state does not appear when the lattice is not distorted.
- 社団法人日本物理学会の論文
- 2006-02-15
著者
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NISHIWAKI Yoichi
Department of Physics, Tokyo Women's Medical University
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Nishiwaki Yoichi
Department Of Physics Graduate School Of Science And Engineering Tokyo Institute Of Technology
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TODOROKI Norikazu
Institute of Physics, Kanagawa University
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Todoroki Norikazu
Institute Of Physics Kanagawa University
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Nishiwaki Yoichi
Department of Basic Sciences, Saitama Medical University, Moroyama, Saitama 350-0495, Japan
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