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

A. Perucchi, B. Joseph, S. Caramazza +7

We report an infrared spectroscopy study of a 200 nm thick FeSe${}_{0.5}$Te${}_{0.5}$ film grown on LaAlO${}_3$ with T${}_c$=13.7 K. We analyze the 20 K normal state absolute reflectance R…