Paramagnetic limit of superconductivity in a crystal without inversion center

TL;DR

This paper develops a theory for the paramagnetic limit of superconductivity in non-centrosymmetric crystals, highlighting how magnetic field orientation affects the suppression of superconductivity due to lifted electronic degeneracy.

Contribution

It provides a theoretical framework explaining the anisotropic paramagnetic suppression of superconductivity in crystals lacking inversion symmetry.

Findings

Superconductivity suppression varies with magnetic field orientation.

Degeneracy lifting of electronic states influences paramagnetic effects.

Certain field directions minimize the paramagnetic suppression.

Abstract

The theory of paramagnetic limit of superconductivity in metals without inversion center is developed. There is in general the paramagnetic suppression of superconducting state. The effect is strongly dependent on field orientation in respect to crystal axes. The reason for this is that the degeneracy of electronic states with opposite momenta forming of Cooper pairs is lifted by magnetic field but for some field directions this lifting can be small or even absent.