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The optical properties of Ba$_{0.6}$K$_{0.4}$Fe$_{2}$As$_{2}$ have beendetermined in the normal state for a number of temperatures over a widefrequency range. Two Drude terms, representing two groups of carriers withdifferent scattering rates ($1/\tau$), well describe the real part of theoptical conductivity, $\sigma_{1}(\omega)$. A "broad" Drude component resultsin an incoherent background with a $T$-independent $1/\tau_b$, while a "narrow"Drude component reveals a $T$-linear $1/\tau_n$ resulting in a resistivity$\rho_n \equiv 1/\sigma_{1n}(\omega\rightarrow 0)$ also linear in temperature.An arctan($T$) low-frequency spectral weight is also a strong evidence for a$T$-linear 1/$\tau$. Comparison to other materials with similar behaviorsuggests that the $T$-linear $1/\tau_n$ and $\rho_n$ inBa$_{0.6}$K$_{0.4}$Fe$_{2}$As$_{2}$ originate from scattering from spinfluctuations and hence that an antiferromagnetic quantum critical point islikely to exist in the superconducting dome.

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