d-wave to s-wave to normal metal transitions in disordered superconductors

TL;DR

This paper investigates how increasing disorder suppresses superconductivity in d-wave materials, predicting two sequential phase transitions from d-wave to s-wave, and then to a normal metal, highlighting a universal behavior independent of interaction sign.

Contribution

It predicts a universal sequence of two low-temperature transitions in disordered d-wave superconductors, from d-wave to s-wave, then to a normal metal.

Findings

Disorder induces a transition from d-wave to s-wave superconductivity.

A subsequent transition from s-wave superconductivity to a normal metal occurs.

The transition sequence is universal, regardless of the sign of the interaction constant.

Abstract

We study suppression of superconductivity by disorder in d-wave superconductors, and predict the existence of (at least) two sequential low temperature transitions as a function of increasing disorder: a d -wave to -wave, and then an s-wave to metal transition. This is a universal property of the system which is independent of the sign of the interaction constant in the s-channel