Evidence of the superconducting energy gap in the optical spectra of
1. and 3. Physikalisches Institut, Universität Stuttgart
Pfaffenwaldring 57, D-70550 Stuttgart, Germany
Corresponding author: firstname.lastname@example.org
Accepted: 6 June 2002
The far-infrared in-plane reflectivity of the organic superconductor -(BEDT-TTF)2I3 is measured down to frequencies of 10 cm-1; the optical conductivity is obtained by a Kramers-Kronig procedure. In the superconducting state an energy gap opens at 25 cm-1 which corresponds to in agreement with moderate coupling. Even well below K a considerable absorption remains for . We discuss different posibilities to explain this behaviour.
PACS: 74.70.Kn – Organic superconductors / 74.25.Gz – Superconductivity: Optical properties
© EDP Sciences, 2002