Dressel, MartinKlein, OlivierGrüner, GeorgeCarlson, K. DouglasWang, H. HauWilliams, Jack M.2009-08-312016-03-312009-08-312016-03-311994316357782http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-46162http://elib.uni-stuttgart.de/handle/11682/7043http://dx.doi.org/10.18419/opus-7026We have performed measurements of the surface impedance in the normal and superconducting states of the title compounds in the millimeter wave-frequency range (1–3 cm-1), and have evaluated the complex conductivity for different crystallographic orientations. Above the transition temperature, the materials behave like metals with a scattering rate of approximately 20 cm-1. In the superconducting state the electrodynamics is in good agreement with calculations based on a BCS ground state: while the penetration depth and the coherence length are anisotropic, the superconducting energy gap shows no indications of line nodes.eninfo:eu-repo/semantics/openAccessSupraleiter , Bisethylendithiotetrathiofulvalen , Elektrodynamik530article