Superconductivity mediated by charge fluctuations in layered molecular crystals
Superconductivity mediated by charge fluctuations in layered molecular crystals
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DOI：
10.1103/physrevlett.87.237002
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发表时间：
2001-12-03
影响因子：
8.6
通讯作者：
McKenzie, RH
中科院分区：
文献类型：
--
作者：
Merino, J;McKenzie, RH
我们考虑了具有 theta 和 beta" 结构的层状分子晶体中超导相、电荷有序相和金属相之间的竞争。将从玻色子理论应用于相关的扩展哈伯德模型，我们表明超导性是由电荷波动介导的，并且库珀对具有 d(xy) 对称性。这与 kappa-(BEDT-TTF)(2)X 族形成鲜明对比，该族的理论计算给出了由自旋波动介导的超导性，并且我们预测几种材料在压力下会变得超导。
We consider the competition between superconducting, charge ordered, and metallic phases in layered molecular crystals with the theta and beta" structures. Applying slave-boson theory to the relevant extended Hubbard model, we show that the superconductivity is mediated by charge fluctuations and the Cooper pairs have d(xy) symmetry. This is in contrast to the kappa-(BEDT-TTF)(2)X family, for which theoretical calculations give superconductivity mediated by spin fluctuations and with d(x)2(-y)2 symmetry. We predict several materials that should become superconducting under pressure.