Evidence of a full gap in LaFeAsO${}_{1-x}$F${}_x$ thin films from infrared spectroscopy

Abstract

We report conventional and time-resolved infrared spectroscopy on LaFeAsO${}_{1-x}$F${}_x$ superconducting thin films. The far-infrared transmission can be quantitatively explained by a two-component model including a conventional s-wave superconducting term and a Drude term, suggesting at least one carrier system has a full superconducting gap. Photo-induced studies of excess quasiparticle dynamics reveal a nanosecond effective recombination time and temperature dependence that agree with a recombination bottleneck in the presence of a full gap. The two experiments provide consistent evidence of a full, nodeless though not necessarily isotropic, gap for at least one carrier system in LaFeAsO${}_{1-x}$F${}_x$.

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• Two-band conductivity of a FeSe${}_{0.5}$Te${}_{0.5}$ film by reflectance measurements in the terahertz and infrared range
• Electrodynamics of superconducting pnictide superlattices