Hidden $T$-Linear Scattering Rate in Ba${}_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$ Revealed by Optical Spectroscopy

Y. M. Dai, B. Xu, B. Shen +5

The optical properties of Ba${}_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$ have been determined in the normal state for a number of temperatures over a wide frequency range. Two Drude terms, re…