Superconducting gap anisotropy sensitive to nematic domains in FeSe

Orthorhombic crystal system
DOI: 10.1038/s41467-017-02739-y Publication Date: 2018-01-12T16:00:20Z
ABSTRACT
The structure of the superconducting gap in unconventional superconductors holds a key to understand momentum-dependent pairing interactions. In FeSe, there have been controversial results reporting nodal and nodeless structures, raising fundamental issue mechanisms iron-based superconductivity. Here, by utilizing polarization-dependent laser-excited angle-resolved photoemission spectroscopy, we report detailed momentum dependence single- multi-domain regions orthorhombic FeSe crystals. We confirm that has twofold in-plane anisotropy, associated with nematicity due orbital ordering. twinned regions, clearly find finite minima near vertices major axis elliptical zone-centered Fermi surface, indicating state. contrast, single-domain drops steeply zero narrow angle range, evidencing for nascent nodes. Such unusual node lifting can be explained nematicity-induced time-reversal symmetry breaking twin boundaries.
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