Dressel, MartinEldridge, John E.Wang, H. HauGeiser, UrsWilliams, Jack M.2009-08-312016-03-312009-08-312016-03-311993316352942http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-46082http://elib.uni-stuttgart.de/handle/11682/7037http://dx.doi.org/10.18419/opus-7020The title compound is the only known organic superconductor (Tc = 0.8 K) with an α-phase crystal structure, in which the conducting plane contains single BEDT-TT F molecules with alternating orientation, rather than the pairs of molecules found in the higher Tc k-phase compounds. We have measured the polarized reflectivity of protonated and deuterated (BEDT-TTF)2(NH4)Hg(NCS)4., from 80 cm-1 to 8000 cm-1, at temperatures between 6.5 K and 300 K. The overall shape of these spectra are discussed. The optical conductivity obtained after a Kramers-Kronig analysis shows no maximum in the mid-infrared as known from the compounds of the κ-phase due to the lack of dimerization of the BEDT-TTF molecules. This causes an accentuation of the far-infrared intraband conductivity. The vibrational features are assigned and discussed.eninfo:eu-repo/semantics/openAccessSupraleiter , Bisethylendithiotetrathiofulvalen , Infrarot-Reflexionsspektroskopie530article2010-11-22