The spin susceptibility is an important probe to characterize the symmetry of the order parameter in unconventional superconductors. Among them, nonunitary triplet superconductors have attracted a lot of attention recently in the context of the search for topological superconductivity. Here, we derive a general formula for the spin susceptibility of nonunitary triplet superconductors within a single-band model of non-magnetic, centrosymmetric materials with strong spin-orbit coupling. We use it to critically assess experimental claims of nonunitary triplet superconductivity in some materials.
@article{arxiv.2212.11226,
title = {Spin susceptibility of nonunitary spin-triplet superconductors},
author = {Thomas Bernat and Julia S. Meyer and Manuel Houzet},
journal= {arXiv preprint arXiv:2212.11226},
year = {2024}
}