Van Hove Singularity and Superconductivity in Disordered Sr2RuO4

TL;DR

This paper investigates how disorder and a van Hove singularity near the Fermi level affect the critical temperature in p-wave superconductors, specifically modeling Sr2RuO4 using CPA to match experimental observations.

Contribution

It introduces a simple model incorporating CPA and van Hove singularity effects to explain the disorder influence on T_C in Sr2RuO4.

Findings

Model reproduces experimental T_C behavior in Sr2RuO4

Shows the significance of van Hove singularity proximity to E_F

Highlights disorder's impact on p-wave superconductivity

Abstract

On the basis of a simple model we analyse the influence of disorder on critical temperature T_C in p-wave superconductors. The disorder is treated by means of the Coherent Potential Approximation (CPA) and we focus our attention on the effect of a van Hove singularity near Fermi energy E_F. For the appropriate values of its parameters our model reproduces the experimentally found behaviour of Sr2RuO4.