Novel Charge Order and Superconductivity in Two-Dimensional Frustrated Lattice at Quarter Filling(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
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概要
- 論文の詳細を見る
Motivated by the various physical properties observed in θ-(BEDT-TTF)_2X, we study the ground state of an extended Hubbard model on two-dimensional anisotropic triangular lattice at 1/4-filling with the variational Monte Carlo method. It is shown that the nearest-neighbor Coulomb interaction enhances charge fluctuation and it induces anomalous states such as the charge-ordered metallic state and triplet next-nearest-neighbor f-wave superconductivity. We consider that these results can explain the coexistence of different charge orders observed in the case of X=CsCo(SCN)_4 and superconductivity in the case of X=I_3. We then propose a unified view of the family of organic conductors θ-(BEDT-TTF)_2X with the value of t_c/t_p.
- 社団法人日本物理学会の論文
- 2006-06-15
著者
-
OGATA Masao
Department of Physics, University of Tokyo
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Watanabe Hiroshi
Department of Cardiology, Niigata City General Hospital
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Watanabe Hiroshi
Department Of Applied Chemistry And Bioengineering Graduate School Of Engineering Osaka City Univers
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Ogata Masao
Department Of Basic Science Graduate School Of Arts And Science University Of Tokyo
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