Kramers' degenerate magnetism and superconductivity

Adil Amin; Hao Wu; Tatsuya Shishidou; Daniel F. Agterberg

doi:10.1103/PhysRevB.109.024502

paper

Kramers' degenerate magnetism and superconductivity

arXiv:2306.11218 · doi:10.1103/PhysRevB.109.024502

Abstract

Motivated by the recent discovery of odd-parity multipolar antiferromagnetic order in CeRh $_{2}$ As $_{2}$ , we examine the coexistence of such translation invariant Kramers' degenerate magnetic states and superconductivity. We show that the presence of such magnetic states generically suppresses superconductivity, whether it be spin-singlet or spin-triplet, unless the magnetic state drives a symmetry-required pair density wave (PDW) superconducting order. We apply our results to CeRh $_{2}$ As $_{2}$ , where no pair density wave order appears; and to the loop current order in the cuprates, where such pair density wave superconductivity must appear together with Bogoliubov Fermi surfaces. In the former case, we explain why superconductivity is not suppressed.

arXiv comment11 pages, 4 Figures

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