Van Hove Singularity and D-Wave Pairing in Disordered Superconductors

Details Van Hove Singularity and D-Wave Pairing in Disordered Superconductors Van Hove Singularity and D-Wave Pairing in Disordered Superconductors

1998-01-06

arxiv.org/abs/cond-mat/9801035v1

Physics

Condensed Matter

Superconductivity

4 pages of text and 7 postscript files

Scientific paper

10.1016/S0921-4534(98)00600-5

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-\delta} alloys.

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