Nodeless energy gaps of single-crystalline Ba0.68K0.32Fe2As2 as seen via 75As NMR

Z. Li, D. L. Sun, C. T. Lin +3

We report ${}^{75}$As nuclear magnetic resonance studies on a very clean hole-doped single-crystal Ba${}_{0.68}$K${}_{0.32}$Fe${}_2$As${}_2$ ($T_{\mathrm{c}}=38.5$ K). The spin-lattice rela…