Non-Stripe Charge Order in the θ-Phase Organic Conductors
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概要
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Phase diagrams of charge order patterns of the θ-phase organic conductors are investigated on the basis of the static-limit extended Hubbard model including the second nearest Coulomb repulsion V'. Since theθ-phase is close to the triangular lattice rather than the square lattice, a 3-fold non-stripe charge order is stable in a considerably large region between the stripe phases and the uniform phase. At finite temperatures, such unevenly ordered patterns as the 3-fold phase D^+D^<1/4>_2 become more stable than the evenly ordered stripes, D^+D^0, and it is unlikely that the stripe phase directly transforms to the uniform phase. These results suggest the existence of an unevenly ordered pattern in the metallic state ofθ-(BEDT-TTF)_2RbM(SCN)_4 [BEDT-TTF: bis(ethyleneditho)tetrathiafulvalene, M = Zn and Co] above T_<MI> 190 K, accounting for the observation of modulated structures in the X-ray measurement, broadening of the NMR line, flat temperature dependence of the resistivity, and the first-order character of the 190 K transition.
- 社団法人日本物理学会の論文
- 2003-06-15
著者
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MORI Takehiko
Department of Organic and Polymeric Materials, Graduate School of Science and Engineering, Tokyo Ins
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Mori Takehiko
Department Of Organic And Polymeric Materials Graduate School Of Science And Engineering Tokyo Insti
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Mori Takehiko
Department Of Hematology Tokyo Women's Medical University
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