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DY: Fachverband Dynamik und Statistische Physik
DY 29: Poster II
DY 29.36: Poster
Donnerstag, 28. Februar 2008, 16:00–18:00, Poster C
Gauge Dependence of the Critical Dynamics at the Superconducting Phase Transition — Maxim Dudka1, •Reinhard Folk2, and Günter Moser3 — 1Institute for Condensed Matter Physics, National Academy of Sciences of Ukraine, UA–79011 Lviv, Ukraine — 2Institut für Theoretische Physik, Johannes Kepler Universität Linz, A–4040 Linz, Austria — 3Fachbereich Materialforschung und Physik, Universität Salzburg, A–5020 Salzburg, Austria
The critical dynamics of superconductors in the charged regime is reconsidered within field-theory. For the dynamics the Ginzburg-Landau model with complex order parameter coupled to the gauge field suggested earlier [Lannert et al. Phys. Rev. Lett. 92, 097004 (2004)] is used. Assuming relaxational dynamics for both quantities the RG functions within one loop approximation are recalculated for different choices of the gauge. A gauge independent result for the divergence of the measurable electric conductivity is obtained only at the weak scaling fixed point - unstable in one loop order - where the time scales of the order parameter and the gauge field are different.
Supported by the Austrian Fonds zur Förderung der wissenschaftlichen Forschung, project No P19583.