부산대학교 도서관

We report $^{77}$Se NMR data in the normal and superconducting states of asingle crystal of FeSe for several different field orientations. The Knightshift is suppressed in the superconducting state for in-plane fields, but doesnot vanish at zero temperature. For fields oriented out of the plane, little orno reduction is observed below $T_c$. These results reflect spin-singletpairing emerging from a nematic state with large orbital susceptibility andspin-orbit coupling. The spectra and spin-relaxation rate data revealelectronic inhomogeneity that is enhanced in the superconducting state,possibly arising from enhanced density of states in the vortex cores. Despitethe spin polarization of these states, there is no evidence forantiferromagnetic fluctuations.