Two distinct superconducting pairing states divided by the nematic end point in FeSe _{1− <i>x</i>} S _<i>x</i>

Abstract

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.