Strong-coupling Spin-singlet Superconductivity with Multiple Full Gaps in Hole-doped Ba${}_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$ Probed by Fe-NMR

M. Yashima, H. Nishimura, H. Mukuda +7

We present ${}^{57}$Fe-NMR measurements of the novel normal and superconducting-state characteristics of the iron-arsenide superconductor Ba${}_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$ ($T_c$ = 38…