Kramer’s degenerate magnetism and superconductivity: Part II: Applications

We apply the general formalism of Kramer’s degenerate magnetism and superconductivity to two specific realizations: loop current order in the Cuprates and CeRh₂As₂. We show that loop current order suppresses uniform superconductivity. However, we further show that the system is unstable towards a finite momentum pairing state which restores superconductivity. Numerically we find this finite momentum state tends to strongly reduce the Bogoliubov Fermi surfaces. We contrast this to CeRh₂As₂, where we show that only a uniform superconducting state exists, and we argue that superconductivity persists due to the non-symmorphic crystal structure.