Two distinct superconducting pairing states divided by the nematic end point in FeSe_1-x S _x.

ABSTRACT: 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 FeSe_1-x S _x , 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 pha

SUBMITTER: Hanaguri T 

PROVIDER: S-EPMC5969813 | biostudies-literature | 2018 May

REPOSITORIES: biostudies-literature