We study the micorscopic origin of the multiple superconducting and magnetic phases observed in CeRh₂As₂. We exploit the existence of a van Hove singularity enforced by the nonsymmorphic symmetry to conduct a renormalization group analysis. When Fermi-surface nesting is strong, we find two closely-competing superconducting states with opposite parities, as well as an instability towards specific spin-density wave states, consistent with key features of the phase diagram of CeRh₂As₂.
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Lee et al. (2024) studied this question.
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