Pair breaking in superconductors with strong spin-orbit coupling
D. C. Cavanagh, Daniel F. Agterberg, P. M. R. Brydon
DOI 10.1103/PhysRevB.107.L060504 · Physical Review B
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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 counterintuitive results. We demonstrate this for p-wave pairing in the effective j=32 electronic states of the Luttinger-Kohn model.
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