Pair-breaking in superconductors with strong spin-orbit coupling

Abstract

We study the influence of symmetry-breaking perturbations on superconductivity in multiorbital materials, with a particular focus on an external magnetic field. We introduce the field-fitness function which characterizes the pair-breaking effects of the perturbation on a given superconducting state. For even parity superconductors we find that this field-fitness function for an external magnetic field is one, implying that the paramagnetic response is controlled only by a generalized effective $g$-factor. For odd parity superconductors, the interplay of the effective $g$-factor and the field-fitness function can lead to counter-intuitive results. We demonstrate this for $p$-wave pairing in the effective $j=3/2$ electronic states of the Luttinger-Kohn model.

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Cited by in corpus (4)

• Superconductivity of anomalous pseudospin
• Theory of the low- and high-field superconducting phases of UTe${}_2$
• Discontinuous Transition to Superconducting Phase
• Multipolar fluctuations from localized 4f electrons in CeRh2As2