@article {Perucchi2014a,
	title = {Two-band conductivity of a FeSe0.5Te0.5 film by reflectance measurements in the terahertz and infrared range},
	journal = {Superconductor science and technology (Print)},
	volume = {27},
	year = {2014},
	publisher = {IOP Publishing,},
	address = {Bristol},
	abstract = {We report an infrared spectroscopy study of a 200 nm thick FeSe0.5Te0.5 film grown on LaAlO3 with T-c = 13.7 K. We analyze the 20 K normal state absolute reflectance R-N measured over a broad infrared range and the reflectance ratio R-S/R-N, R-S being the superconducting state reflectance, measured at 6 K in the terahertz range down to 12 cm(-1). We show that the normal state model conductivity is given by two Drude components, one of which much broader and intense than the other. In the superconducting state, we find that a gap Delta = 37 +/- 3 cm(-1) opens up in the narrow Drude band only, while the broad Drude band results to be ungapped, at least in the explored spectral range. Our results show that only a two-band model can coherently describe both normal and superconducting state data.},
	keywords = {infrared spectroscopy, iron-based superconductors, optical gap},
	issn = {0953-2048},
	doi = {10.1088/0953-2048/27/12/125011},
	author = {Perucchi, A. and Joseph, B. and Caramazza, S. and Autore, M. and Bellingeri, E. and Kawale, S. and Ferdeghini, C. and Putti, M. and Lupi, S. and Dore, P.}
}
