Doping and energy dependent microwave conductivity of kinetic energy driven superconductors with extended impurities

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• 作者：Zhi Wang ; Huaiming Guo ; Shiping Feng
• 关键词：Microwave conductivity ; Kinetic energy driven superconductor ; Extended impurity ; Cuprate superconductor
• 刊名：Physica C
• 出版年：2008
• 出版时间：15 July 2008
• 年：2008
• 卷：468
• 期：14
• 页码：1078-1084
• 全文大小：303 K

文摘

Within the framework of the kinetic energy driven superconducting mechanism, the effect of the extended impurity scatterers on the quasiparticle transport of cuprate superconductors in the superconducting state is studied based on the nodal approximation of the quasiparticle excitations and scattering processes. It is shown that there is a cusplike shape of the energy dependent microwave conductivity spectrum. At low temperatures, the microwave conductivity increases linearly with increasing temperatures, and reaches a maximum at intermediate temperature, then decreases with increasing temperatures at high temperatures. In contrast with the dome shape of the doping dependent superconducting gap parameter, the minimum microwave conductivity occurs around the optimal doping, and then increases in both underdoped and overdoped regimes.