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

R. Valdés Aguilar, L. S. Bilbro, S. Lee +6

We report a study of high quality pnictide superconductor BaFe${}_{1.84}$Co${}_{0.16}$As${}_2$ thin films using time-domain THz spectroscopy. Near T${}_c$ we find evidence for a coherence…