Non-symmorphic symmetry and field-driven odd-parity pairing in CeRh$_2$As$_2$

D.C. Cavanagh; D.F. Agterberg; M. Weinert; P.M.R. Brydon; T. Shishidou

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arxiv 2106.02698 v2 pith:GI4KH7V6 submitted 2021-06-04 cond-mat.supr-con cond-mat.str-el

Non-symmorphic symmetry and field-driven odd-parity pairing in CeRh₂As₂

D.C. Cavanagh , T. Shishidou , M. Weinert , P.M.R. Brydon , D.F. Agterberg This is my paper

classification cond-mat.supr-con cond-mat.str-el

keywords cerhodd-parityeven-non-symmorphicstructuretransitionargueboundaries

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Recently, evidence has emerged for a field-induced even- to odd-parity superconducting phase transition in CeRh$_2$As$_2$ [S. Khim et al., Science 373 1012 (2021)]. Here we argue that the P4/nmm non-symmorphic crystal structure of CeRh$_2$As$_2$ 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.

Non-symmorphic symmetry and field-driven odd-parity pairing in CeRh₂As₂

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