Evidence of the superconducting energy gap in the optical spectra of ${\alpha }_t$-(BEDT-TTF)${}_2$I${}_3$

N. Drichko, P. Haas, B. Gorshunov +2

The far-infrared in-plane reflectivity of the organic superconductor ${\alpha }_t$-(BEDT-TTF)${}_2$I${}_3$ is measured down to frequencies of 10 cm${}^{-1}$; the optical conductivity is obta…