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We report a study of high quality pnictide superconductorBaFe$_{1.84}$Co$_{0.16}$As$_2$ thin films using time-domain THz spectroscopy.Near T$_c$ we find evidence for a coherence peak and qualitative agreement withthe weak-coupling Mattis-Bardeen form of the conductivity. At low temperature,we find that the real part of the THz conductivity is not fully suppressed and$\sigma_2$ is significantly smaller than the Matthis-Bardeen expectation. Thetemperature dependence of the penetration depth $\lambda$ follows a power lawwith an unusually high exponent of 3.1. We interpret these results asconsistent with impurity scattering induced pair-breaking. Taken together ourresults are strong evidence for an extended s$\pm$ symmetry order parameter.

Observation of a coherence peak and pair-breaking effects in THz conductivity of BaFe$_{2-2x}$Co$_{2x}$As$_2$