CeRh2As2, a non-symmorphic heavy fermion material, was recently reported to host a remarkable phase diagram with two superconducting phases. In this material, the two inequivalent Ce sites per unit cell, related by inversion symmetry, introduce a sublattice structure corresponding to an extra internal degree of freedom. Here we propose a classification of the possible superconducting states in CeRh2As2 from the two Ce-sites perspective. Based on the superconducting fitness analysis, we discuss two limits: a two-dimensional, Rashba spin-orbit coupling dominated normal state; and a three-dimensional, inter-layer hopping dominated normal state. In both limits, we are able find two scenarios that generate phase diagrams in qualitative agreement with experiments.
Laboratory for Scientific Computing and Modelling
Condensed Matter Theory
Meeting ID: 675 2137 3796