Nonsymmorphic symmetry and field-driven odd-parity pairing in Ce Rh 2 As 2

Journal Article · 24 January 2022 · Physical Review. B

DOI: https://doi.org/10.1103/physrevb.105.l020505 · OSTI ID:1979772

Cavanagh, D. C.  ^[1]; Shishidou, T.  ^[2]; Weinert, M.  ^[2]; Brydon, P. R.  ^[3]; Agterberg, Daniel F.  ^[2]

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1. University of Otago, Dunedin (New Zealand); OSTI
2. University of Wisconsin, Madison, WI (United States)
3. University of Otago, Dunedin (New Zealand)

Recently, evidence has emerged for a field-induced even- to odd-parity superconducting phase transition in CeRh₂As₂. In this paper 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.

• Research Organization: University of Wisconsin, Madison, WI (United States); West Virginia University, Morgantown, WV (United States)
• Sponsoring Organization: Marsden Fund Council; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)
• Grant/Contract Number: SC0017632; SC0021971
• OSTI ID: 1979772
• Journal Information: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 2 Vol. 105; ISSN 2469-9950
• Publisher: American Physical Society (APS)Copyright Statement
• Country of Publication: United States
• Language: English