Unified picture of superconductivity and magnetism in CeRh2As2
Abstract
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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