Superconducting gap anisotropy sensitive to nematic domains in FeSe

Takahiro Hashimoto, Yuichi Ota, Haruyoshi Q. Yamamoto, Yuya Suzuki, Takahiro Shimojima, Shuntaro Watanabe, Chuangtian Chen, Shigeru Kasahara, Yuji Matsuda, Takasada Shibauchi, Kozo Okazaki () and Shik Shin ()
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Takahiro Hashimoto: University of Tokyo
Yuichi Ota: University of Tokyo
Haruyoshi Q. Yamamoto: University of Tokyo
Yuya Suzuki: University of Tokyo
Takahiro Shimojima: University of Tokyo
Shuntaro Watanabe: Tokyo University of Science
Chuangtian Chen: Chinese Academy of Science (CAS)
Shigeru Kasahara: Kyoto University
Yuji Matsuda: Kyoto University
Takasada Shibauchi: University of Tokyo
Kozo Okazaki: University of Tokyo
Shik Shin: University of Tokyo

Nature Communications, 2018, vol. 9, issue 1, 1-7

Abstract: 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.

Date: 2018
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DOI: 10.1038/s41467-017-02739-y

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