Far-infrared probe of superconductivity in SmO${}_{1-x}$F${}_x$FeAs}

S. I. Mirzaei, V. Guritanu, A. B. Kuzmenko +5

We report far-infrared reflectance measurements on polycrystalline superconducting samples of SmO${}_{1-x}$F${}_x$FeAs ($x$ = 0.12, 0.15 and 0.2). We clearly observe superconductivit…