Superconductivity and a Mott Transition in a Hubbard Model on an Anisotropic Triangular Lattice(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
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概要
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A half-filled-band Hubbard model on an anisotropic triangular lattice (t in two bond directions and t' in the other) is studied using an optimization variational Monte Carlo method, to consider a Mott transition and superconductivity arising in k-(BEDT-TTF)_2X. Adopting wave functions with doublon-holon binding factors, we reveal that a first-order Mott (conductor-to-nonmagnetic insulator) transition takes place at U=U_c, approximately of the bandwidth, for a wide t'/t range. This transition is not directly connected to magnetism. Robust d-wave superconductivity appears in a restricted parameter range: immediately below U_c and the moderate strength of frustration (0.4 ≲t'/t ≲ 0.7), where short-range antiferromagnetic correlation sufficiently develops but does not come to a long-range order. The relevance to experiments is also discussed.
- 社団法人日本物理学会の論文
- 2006-07-15
著者
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Tanaka Y
Nagoya Univ. Nagoya Jpn
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Inoue Jun-ichiro
Department Of Applied Physics Nagoya University
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Inoue J
Nagoya Univ. Nagoya
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Watanabe T
Ntt Basic Research Laboratory
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Watanabe T
Department Of Applied Physics Nagoya University:crest Japan Science And Technology Corporation (jst)
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TANAKA Yukio
Department of Applied Physics, Nagoya University
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YOKOYAMA Hisatoshi
Department of Physics, Tohoku University
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WATANABE Tsutomu
Department of Applied Physics, Nagoya University
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Inoue J
Department Of Basic Science University Of Tokyo:core Research For Evolutional Science And Technology
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Watanabe Tomohiko
Department Of Mechanical Engineering Nagoya University
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渡辺 二太
Department Of Applied Physics Nagoya University:crest Japan Science And Technology Corporation (jst)
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Yokoyama H
Department Of Physics Tohoku University
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Yokoyama Hisatoshi
Department Of Applied Physics Tohoku University
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Tanaka Yukio
Department Of Applied Physics Nagoya University
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Watanabe Tsutomu
Department Of Applied Physics Faculty Of Engineering The University Of Tokyo
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Inoue Jun-ichiro
Department of Applied Physics, Nagoya University
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TANAKA Yukio
Department of Applied Physics, Nagoya University:CREST Japan Science and Technology Corporation (JST)
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