The dimer model for κ-phase organic superconductors
The dimer model for κ-phase organic superconductors
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κ相有机超导体的二聚体模型
DOI：
10.1209/epl/i1998-00273-1
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
I.
中科院分区：
文献类型：
--
作者：
G. Visentini;A. Painelli;A. Girlando;A. F. P. U. ;I.
我们证明了κ相BEDT-TTf盐的上电子能带可以用紧束缚晶格模拟，每个晶胞只有一个格位。能带参数来自最近的从头计算，得到了非常简单但极其准确的单电子图像。这张图允许我们采用实空间配对势来求解BCS间隙方程。将得到的超导性质与实验进行比较，指出了各向同性的S0配对。残留的多体或声子介导的相互作用为κ相BEDT-TTF盐中观察到的各种物理性质提供了一个合理的解释。
We prove that the upper electronic bands of κ-phase BEDT-TTF salts are adequately modeled by a tight-binding lattice with one site per cell. The band parameters are derived from recent ab initio calculations, getting a very simple but extremely accurate one-electron picture. This picture allows us to solve the BCS gap equation adopting a real-space pairing potential. Comparison of the resulting superconducting properties with experiments points to isotropic s0-pairing. Residual many-body or phonon-mediated interactions offer a plausible explanation of the large variety of physical properties observed in κ-phase BEDT-TTF salts.