Mean-Field Study of Charge Order with Long Periodicity in θ-(BEDT-TTF)_2X(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

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概要

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• Charge ordering phenomenon in θ-(BEDT-TTF)_2X is studied by using 1/4-filled extended Hubbard model on an anisotropic triangular lattice through mean-field approximation. It is found that a metallic charge ordered state with 3-periodicity on lattices (3-fold type charge order) is realized in the realistic parameter region where the nearest neighbor Coulomb interaction V_<ij> is nearly isotropic. This 3-fold state survives up to high temperatures by estimating the free energy. Insulating state with diagonal or verticaltype charge ordering appears as increasing anisotropy of V_<ij>. Considering the effect of the structural distortion observed in θ-(BEDT-TTF)_2RbZn(SCN)_4 at low temperatures, horizontal-type charge ordered insulating phase tends to be stabilized and the region where 3-fold type exists becomes narrower. Our results are consistent with the metallic state with long periodic charge order which can be related to 3-fold type in θ-(BEDT-TTF)_2RbZn(SCN)_4 at high temperatures and insulating state with horizontal charge order at low temperatures. For θ-(BEDT-TTF)_2CsZn(SCN)_4, we speculate several kinds of charge-ordered states are energetically competing with each other leading to an inhomogeneous state at low temperatures.

• 社団法人日本物理学会の論文
• 2006-01-15

著者

• OGATA Masao

  Department of Physics, University of Tokyo

• KANEKO Masato

  Department of Physics, University of Tokyo

• Ogata Masao

  Department Of Basic Science Graduate School Of Arts And Sciences The University Of Tokyo

• Kaneko Masato

  Department Of Computer Science College Of Engineering Nihon University

• Kaneko Masato

  Department Of Physics University Of Tokyo

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