Abrupt change of the superconducting gap structure at the nematic critical point in FeSe1—xSₓ

The emergence of the nematic electronic state that breaks rotational symmetry is one of the most fascinating properties of the iron-based superconductors, and has relevance to cuprates as well. FeSe has a unique ground state in which superconductivity coexists with a nematic order without long-range...

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Bibliographic Details
Published in:Proceedings of the National Academy of Sciences - PNAS 2018-02, Vol.115 (6), p.1227-1231
Main Authors: Sato, Yuki, Kasahara, Shigeru, Taniguchi, Tomoya, Xing, Xiangzhuo, Kasahara, Yuichi, Tokiwa, Yoshifumi, Yamakawa, Youichi, Kontani, Hiroshi, Shibauchi, Takasada, Matsuda, Yuji
Format: Article
Language:English
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Physical Sciences
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Summary:The emergence of the nematic electronic state that breaks rotational symmetry is one of the most fascinating properties of the iron-based superconductors, and has relevance to cuprates as well. FeSe has a unique ground state in which superconductivity coexists with a nematic order without long-range magnetic ordering, providing a significant opportunity to investigate the role of nematicity in the superconducting pairing interaction. Here, to reveal how the superconducting gap evolves with nematicity, we measure the thermal conductivity and specific heat of FeSe1—xSₓ, in which the nematicity is suppressed by isoelectronic sulfur substitution and a nematic critical point (NCP) appears at xc ≈ 0.17. We find that, in the whole nematic regime (0 < x
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.1717331115