Nonmagnetic Insulating States near the Mott Transitions on Lattices with Geometrical Frustration and Implications for K-(ET)_2Cu_2(CN)_3
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概要
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We study phase diagrams of the Hubbard model on anisotropic triangular lattices, which also represents a model for k-type BEDT-TTF compounds. In contrast with mean-field predictions, pathintegral renormalization group calculations show a universal presence of a nonmagnetic insulator sandwiched by an antiferromagnetic insulator and paramagnetic metals. The nonmagnetic phase does not show simple translational symmetry breakings such as flux phases, implying a genuine Mott insulator. We discuss possible relevance to the nonmagnetic insulating phase found in K-(ET)_2Cu_2(CN)_3.
- 社団法人日本物理学会の論文
- 2002-09-15
著者
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Imada Masatoshi
Institute For Solid State Physics The University Of Tokyo
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Watanabe Shinji
Institute For Solid State Physics University Of Tokyo
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MORITA Hidekazu
Institute for Solid State Physics, University of Tokyo
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Morita Hidekazu
Institute For Solid State Physics University Of Tokyo
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