Van Hove Singularity and D-Wave Pairing in Disordered Superconductors

Abstract

We apply the coherent potential approximation (CPA) to a simple model for disordered superconductors with d-wave pairing. We demonstrate that whilst the effectiveness of an electronic Van Hove singularity to enhance the transition temperature T${}_c$ is reduced by disorder it is not eliminated. In fact we give a qualitative account of changes in the T${}_c$ vs. doping curve with increasing disorder and compare our results with experiments on the Y_{0.8}Ca_{0.2}Ba_2(Cu_{1-c}Zn_c)_{3}O_{7-δ} alloys.

4 pages of text and 7 postscript files

References in corpus (1)

• Self-consistent interface properties of d and s-wave superconductors

Cited by in corpus (6)

• Coherent Potential Approximation for `d - wave' Superconductivity in Disordered Systems
• BCS to Bose Crossover in Anisotropic Superconductors
• Designer Meron Lattice on the Surface of a Topological Insulator
• Superconducing Alloys with Weak and Strong Scattering: Anderson's Theorem and a Superconductor-Insulator Transition
• Van Hove Singularity and Superconductivity in Disordered Hubbard Model
• Spatial fluctuations of the pairing potential in disordered superconductors