Multiband behavior and non-metallic low-temperature state of K${}_{0.50}$Na${}_{0.24}$Fe${}_{1.52}$Se${}_2$

Hyejin Ryu, F. Wolff-Fabris, J. B. Warren +3

We report evidence for multiband transport and an insulating low-temperature normal state in superconducting K${}_{0.50}$Na${}_{0.24}$Fe${}_{1.52}$Se${}_2$ with $T_c\approx 20$ K. The…