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Title: Superconducting gap anisotropy sensitive to nematic domains in FeSe
Authors: Hashimoto, Takahiro
Ota, Yuichi
Yamamoto, Haruyoshi Q.
Suzuki, Yuya
Shimojima, Takahiro
Watanabe, Shuntaro
Chen, Chuangtian
Kasahara, Shigeru  kyouindb  KAKEN_id
Matsuda, Yuji
Shibauchi, Takasada
Okazaki, Kozo
Shin, Shik
Author's alias: 笠原, 成
Issue Date: 20180118
Publisher: Springer Nature
Journal title: Nature Communications
Volume: 9
Thesis number: 282
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.
Rights: © The Author(s) 2018. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit
DOI(Published Version): 10.1038/s41467-017-02739-y
PubMed ID: 29348671
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