Two distinct superconducting pairing states divided by the nematic end point in FeSe1−xSx

Tetsuo Hanaguri, Katsuya Iwaya, Yuhki Kohsaka, Tadashi Machida, Tatsuya Watashige, Shigeru Kasahara, Takasada Shibauchi, Yuji Matsuda

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71 Citations (Scopus)


Unconventional superconductivity often competes or coexists with other electronic orders. In iron-based superconductors, a central issue has been the relationship between superconductivity and electronic nematicity, spontaneous breaking of the lattice rotational symmetry. Using spectroscopic-imaging scanning tunneling microscopy, we simultaneously investigated the electronic structure and the superconducting gap in FeSe1xSx, where the nematicity diminishes above the nematic end point (NEP) at x = 0.17. The nematic band structure appears as anisotropic quasiparticle-interference patterns that gradually become isotropic with increasing x without anomalies at the NEP. By contrast, the superconducting gap, which is intact in the nematic phase, discontinuously shrinks above the NEP. This implies that the presence or absence of nematicity results in two distinct pairing states, whereas the pairing interaction is insensitive to the strength of nematicity.

Original languageEnglish
Article numbereaar6419
JournalScience Advances
Issue number5
Publication statusPublished - May 25 2018
Externally publishedYes

ASJC Scopus subject areas

  • General


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