Lifting of gap nodes by disorder in ultranodal superconductor candidate FeSe1-xSx

T. Nagashima, K. Ishihara, K. Imamura +8

The observation of time-reversal symmetry breaking and large residual density of states in tetragonal FeSe${}_{1-x}$S${}_x$ suggests a novel type of ultranodal superconducting state wi…