Thermal conductivity study of KFe${}_2$As${}_2$ single crystal: clear evidence for unconventional superconducting gap with nodes

J. K. Dong, S. Y. Zhou, T. Y. Guan +7

The in-plane resistivity $\rho$ and thermal conductivity $\kappa$ of extremely overdoped KFe${}_2$As${}_2$ ($T_c$ = 3.0 K) single crystal were studied. It is found that $\rho \sim T^{1.5}$ at low…