Journal
PHYSICAL REVIEW LETTERS
Volume 120, Issue 26, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.120.267001
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Funding
- National High Magnetic Field Laboratory through NSF [DMR-1157490]
- State of Florida
- Office of Basic Energy Sciences, U.S. Department of Energy [DE-SC0012336, DE-SC0014402]
- NSF [PHY 17-48958]
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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 T-c, but gives rise to cos 2 theta 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 d(xz) orbital on the hole pocket, and increases (reduces) the weight of the d(xy), orbital on the Y (X) electron pocket.
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