Evidence for Unconventional Superconductivity in Arsenic-Free Iron-Based Superconductor FeSe : A ^77Se-NMR Study

H. Kotegawa, S. Masaki, Y. Awai +3

We report the results of ${}^{77}$Se--nuclear magnetic resonance (NMR) in $\alpha$-FeSe, which exhibits a similar crystal structure to the LaFeAsO${}_{1-x}$F${}_x$ superconductor and shows su…