Hamzic, BojanaCreuzet, GerardSchweitzer, DieterKeller, Heimo J.2011-07-212016-03-312011-07-212016-03-311986352317817http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-64505http://elib.uni-stuttgart.de/handle/11682/7617http://dx.doi.org/10.18419/opus-7600We report high resolution thermal expansion measurements between 1.2 and 300 K along the c*-axis in the organic conductor β-(BEDT-TTF)2I3 where the superconducting properties are strongly dependent on the way the system is prepared in the pressure-temperature diagram. We clearly observed a strong anomaly at 172 K related to the structural phase transition and the resistivity anomalies reported by several groups. The temperature analysis in the low temperature regime is coherent with a phonon dominant contribution. Finally, the presence of small hysteresis in a large region around the transitions seem to indicate why both the pressure and the temperature cycling may stabilize small regions of the high-Tc phase of the system, as observed.eninfo:eu-repo/semantics/openAccessOrganischer Supraleiter , Tetrathiafulvalen , Wärmeausdehnung530article