Search results for "High-Tc superconductor"
showing 2 items of 2 documents
Nonlinear Microwave Spectrometer for Investigating High-Tc Superconductors
2000
We describe a nonlinear microwave spectrometer, which can be conveniently used for investigating the harmonic generation at microwave frequencies in high-Tc superconductors. The use of this technique allows highlighting mechanisms responsible for the nonlinear microwave response of high-Tc superconductors as well as measuring specific characteristics of the investigated samples. We report a brief review of the main results obtained.
General interpolation scheme for thermal fluctuations in superconductors
2006
We present a general interpolation theory for the phenomenological effects of thermal fluctuations in superconductors. Fluctuations are described by a simple gauge invariant extension of the gaussian effective potential for the Ginzburg-Landau static model. The approach is shown to be a genuine variational method, and to be stationary for infinitesimal gauge variations around the Landau gauge. Correlation and penetration lengths are shown to depart from the mean field behaviour in a more or less wide range of temperature below the critical regime, depending on the class of material considered. The method is quite general and yields a very good interpolation of the experimental data for very…