Evidence of the superconducting energy gap in the optical spectra of

N. Drichko; P. Haas; B. Gorshunov; D. Schweitzer; M. Dressel

doi:10.1209/epl/i2002-00193-6

All issues

Volume 59 / No 5 (September 2002)

Europhys. Lett., 59 5 (2002) 774-778

Abstract

Issue		Europhys. Lett. Volume 59, Number 5, September 2002


Page(s)		774 - 778
Section		Condensed matter: electronic structure, electrical, magnetic, and optical properties
DOI		https://doi.org/10.1209/epl/i2002-00193-6
Published online		01 September 2002

Europhys. Lett., 59 (5), pp. 774-778 (2002)

Evidence of the superconducting energy gap in the optical spectra of $\chem{\alpha_{\it t}\mbox{-}(BEDT\mbox{-}TTF)_{2}I_{3}}$

N. Drichko, P. Haas, B. Gorshunov, D. Schweitzer and M. Dressel

1. and 3. Physikalisches Institut, Universität Stuttgart Pfaffenwaldring 57, D-70550 Stuttgart, Germany

Corresponding author: dressel@pi1.physik.uni-stuttgart.de

Received: 22 April 2002
Accepted: 6 June 2002

Abstract

The far-infrared in-plane reflectivity of the organic superconductor $\alpha_t$ -(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 $2\Delta/k_{\rm B}T_{\rm c} = 4.4$ in agreement with moderate coupling. Even well below $T_{\rm c}=8$ K a considerable absorption remains for $\hbar\omega<2\Delta$ . We discuss different posibilities to explain this behaviour.

PACS: 74.70.Kn – Organic superconductors / 74.25.Gz – Superconductivity: Optical properties

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