Polar charge fluctuation and superconductivity in organic conductors
Polar charge fluctuation and superconductivity in organic conductors
复制标题
有机导体中的极性电荷波动和超导性
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
S. Ishihara
中科院分区：
文献类型：
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作者：
A. Sekine;J. Nasu;S. Ishihara
研究了具有二聚体分子自由度的有机导体的超导性和极性电荷涨落。通过随机相位近似和波动交换近似分析了考虑二聚体内电子结构和二聚体间库仑相互作用的扩展哈伯德模型。超导性出现在电荷密度波 (CDW) 相附近，其中电子电荷分布在二聚体内部极化。扩展横波型配对受到青睐，并且由于自旋涨落而导致其与超导性的竞争关系取决于三角晶格几何形状。还比较了在极性和非极性 CDW 相附近实现的两种超导性。
Superconductivity and polar charge fluctuation are studied in an organic conductor with the dimer-molecule degree of freedom. The extended Hubbard models, where the intra-dimer electronic structure and the inter-dimer Coulomb interactions are taken into account, are analyzed by the random-phase approximation and the fluctuation-exchange approximation. Superconductivity appears in a vicinity of the charge-density wave (CDW) phase where the electronic charge distributions are polarized inside of dimers. The extended s-wave type paring is favored and its competitive relations with the superconductivity due to the spin fluctuation depends on the triangular lattice geometry. Comparison between two superconductivities realized near the polar and non-polar CDW phases are also presented.