{"database":"biostudies-literature","file_versions":[],"scores":null,"additional":{"omics_type":["Unknown"],"volume":["9(1)"],"submitter":["Hashimoto T"],"pubmed_abstract":["The structure of the superconducting gap in unconventional superconductors holds a key to understand the momentum-dependent pairing interactions. In superconducting FeSe, there have been controversial results reporting nodal and nodeless gap structures, raising a fundamental issue of pairing mechanisms of iron-based superconductivity. Here, by utilizing polarization-dependent laser-excited angle-resolved photoemission spectroscopy, we report a detailed momentum dependence of the gap in single- and multi-domain regions of orthorhombic FeSe crystals. We confirm that the superconducting gap has a twofold in-plane anisotropy, associated with the nematicity due to orbital ordering. In twinned regions, we clearly find finite gap minima near the vertices of the major axis of the elliptical zone-centered Fermi surface, indicating a nodeless state. In contrast, the single-domain gap drops steeply to zero in a narrow angle range, evidencing for nascent nodes. Such unusual node lifting in multi-domain regions can be explained by the nematicity-induced time-reversal symmetry breaking near the twin boundaries."],"journal":["Nature communications"],"pagination":["282"],"full_dataset_link":["https://www.ebi.ac.uk/biostudies/studies/S-EPMC5773685"],"repository":["biostudies-literature"],"pubmed_title":["Superconducting gap anisotropy sensitive to nematic domains in FeSe."],"pmcid":["PMC5773685"],"pubmed_authors":["Shimojima T","Shin S","Shibauchi T","Yamamoto HQ","Watanabe S","Hashimoto T","Okazaki K","Kasahara S","Suzuki Y","Ota Y","Chen C","Matsuda Y"],"additional_accession":[]},"is_claimable":false,"name":"Superconducting gap anisotropy sensitive to nematic domains in FeSe.","description":"The structure of the superconducting gap in unconventional superconductors holds a key to understand the momentum-dependent pairing interactions. In superconducting FeSe, there have been controversial results reporting nodal and nodeless gap structures, raising a fundamental issue of pairing mechanisms of iron-based superconductivity. Here, by utilizing polarization-dependent laser-excited angle-resolved photoemission spectroscopy, we report a detailed momentum dependence of the gap in single- and multi-domain regions of orthorhombic FeSe crystals. We confirm that the superconducting gap has a twofold in-plane anisotropy, associated with the nematicity due to orbital ordering. In twinned regions, we clearly find finite gap minima near the vertices of the major axis of the elliptical zone-centered Fermi surface, indicating a nodeless state. In contrast, the single-domain gap drops steeply to zero in a narrow angle range, evidencing for nascent nodes. Such unusual node lifting in multi-domain regions can be explained by the nematicity-induced time-reversal symmetry breaking near the twin boundaries.","dates":{"release":"2018-01-01T00:00:00Z","publication":"2018 Jan","modification":"2025-04-04T11:30:55.028Z","creation":"2019-03-26T22:58:19Z"},"accession":"S-EPMC5773685","cross_references":{"pubmed":["29348671"],"doi":["10.1038/s41467-017-02739-y"]}}