Anisotropic pairing gap in FeSe
ORAL
Abstract
Superconductivity in FeSe occurs deep inside the nematic phase, but in the absence of any form of magnetic order. As a result, FeSe provides a unique opportunity to investigate pairing in an electronic nematic state, which reconstructs the low-energy band dispersions. We solved the pairing problem within the low-energy model of FeSe, which includes the orbital content of low-energy excitations. We found deep minima of a superconducting gap on the distorted hole pocket. The location of the minima depends on two features: the relative magnitude of the intra-orbital and inter-orbital pairing interactions, and the relative sign of the nematic order parameters on hole and electron pockets. We also discuss a possibility that superconducting order evolves below Tc and breaks time-reversal symmetry below a certain T<Tc. We compare our results with recent experiments in stoichiometric FeSe and S-doped FeSe.
*The work was partly supported by the National High Magnetic Field Laboratory through NSF Grant No. DMR-1157490, the State of Florida, and U. S. DOE, Office of Science, Basic Energy Sciences, under award number de-sc0012336.
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Presenters
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Jian Kang
- Physics, Florida State
- National High Magnetic Field Laboratory, Florida State Univ