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Nonsymmorphic symmetry and field-driven odd-parity pairing in CeRh2As2

D. C. Cavanagh1, T. Shishidou2, M. Weinert2, P. M. R. Brydon3,*, and Daniel F. Agterberg2,†

  • 1Department of Physics, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand
  • 2Department of Physics, University of Wisconsin, Milwaukee, Wisconsin 53201, USA
  • 3Department of Physics and MacDiarmid Institute for Advanced Materials and Nanotechnology, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand

  • *philip.brydon@otago.ac.nz
  • †agterber@uwm.edu
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Phys. Rev. B 105, L020505 – Published 24 January, 2022

DOI: https://doi.org/10.1103/PhysRevB.105.L020505

Abstract

Recently, evidence has emerged for a field-induced even- to odd-parity superconducting phase transition in CeRh2As2 [S. Khim et al., Science 373, 1012 (2021)]. Here we argue that the P4/nmm nonsymmorphic crystal structure of CeRh2As2 plays a key role in enabling this transition by ensuring large spin-orbit interactions near the Brillouin zone boundaries, which naturally leads to the required near-degeneracy of the even- and odd-parity channels. We further comment on the relevance of our theory to FeSe, which crystallizes in the same structure.

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Phys. Rev. B 105, L020505– Published 24 January, 2022
  • Received 28 June 2021
  • Revised 18 November 2021
  • Accepted 3 January 2022
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