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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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
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container_title Proceedings of the National Academy of Sciences - PNAS
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creator Sato, Yuki
Kasahara, Shigeru
Taniguchi, Tomoya
Xing, Xiangzhuo
Kasahara, Yuichi
Tokiwa, Yoshifumi
Yamakawa, Youichi
Kontani, Hiroshi
Shibauchi, Takasada
Matsuda, Yuji
description 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
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title Abrupt change of the superconducting gap structure at the nematic critical point in FeSe1—xSₓ
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