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

TL;DR

This paper investigates how extended impurities affect microwave conductivity in cuprate superconductors within a kinetic energy driven framework, revealing a cusplike energy spectrum and doping-dependent conductivity behavior.

Contribution

It introduces a detailed analysis of impurity effects on microwave conductivity using the kinetic energy driven superconducting mechanism, highlighting new doping and temperature dependencies.

Findings

Microwave conductivity spectrum has a cusplike energy dependence.

At low temperatures, microwave conductivity increases linearly with temperature.

Minimum microwave conductivity occurs around optimal doping.

Abstract

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.