Effects of impurities on Hc2(T) in superconductors without inversion symmetry

TL;DR

This paper investigates how impurities affect the upper critical magnetic field in non-centrosymmetric superconductors, highlighting differences from centrosymmetric cases through exact solutions of gap equations.

Contribution

It provides an exact solution for the linearized gap equations in disordered non-centrosymmetric superconductors, revealing impurity effects on Hc2(T).

Findings

Impurities alter the behavior of Hc2(T) in non-centrosymmetric superconductors.

Differences from centrosymmetric cases are quantitatively characterized.

Exact solutions are obtained for cubic crystal symmetry.

Abstract

We calculate the upper critical field, Hc2(T), due to the orbital pair breaking in disordered superconductors without inversion symmetry. Differences from the usual centrosymmetric case are highlighted. The linearized gap equations in magnetic field, with the singlet and triplet pairing channels mixed by impurity scattering, are solved exactly for a cubic crystal.