Electronic Ferroelectricity in a Dimer Mott Insulator
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概要
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Motivated by recent experiments in $\kappa$-(BEDT-TTF)2Cu2(CN)3, we studied dielectric and magnetic properties of a dimer-Mott insulator. We derived the effective Hamiltonian where the number of electrons per dimer is taken to be one. Charge and magnetic structures at a finite temperature were obtained by using the mean-field and Monte-Carlo methods. Magnetic and ferroelectric phases are exclusive with each other. Dielectric fluctuation is remarkable near the phase boundary between the dimer-Mott and ferroelectric phases. Implications of the present results for $\kappa$-(BEDT-TTF)2Cu2(CN)3 were discussed.
- Physical Society of Japanの論文
- 2010-06-15
著者
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Ishihara Sumio
Department Of Applied Physics University Of Tokyo
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Makoto Naka
Department of Physics, Tohoku University, Sendai 980-8578, Japan
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Sumio Ishihara
Department of Physics, Tohoku University, Sendai 980-8578, Japan
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Naka Makoto
Department of Physics, Tohoku University, Sendai 980-8578, Japan
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