Superconductivity in FeSe: The Role of Nematic Order

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Abstract

Bulk FeSe is a special iron-based material in which superconductivity emerges inside a well-developed nematic phase. We present a microscopic model for this nematic superconducting state, which takes into account the mixing between s-wave and d-wave pairing channels and the changes in the orbital spectral weight promoted by the sign-changing nematic order parameter. We show that nematicity only weakly affects Tc, but gives rise to cos2θ variation of the pairing gap on the hole pocket, whose magnitude and size agrees with angle resolved photoemission spectroscopy and STM data. We further show that nematicity increases the weight of the dxz orbital on the hole pocket, and increases (reduces) the weight of the dxy orbital on the Y (X) electron pocket.

Original languageEnglish (US)
Article number267001
JournalPhysical review letters
Volume120
Issue number26
DOIs
StatePublished - Jun 26 2018

Bibliographical note

Publisher Copyright:
© 2018 American Physical Society.

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