AN EXPERIMENTAL-MODEL FOR THE RESISTIVITY OR CONDUCTIVITY PEAK IN HIGH-T-C SUPERCONDUCTORS

It is shown by electrical modelling that the appearance and type of the resistivity or conductivity peak depends only on the character (or role) of the energy source used during the normal-superconducting or superconducting-normal transition. Treating the substituting circuit as series resistors (source of constant voltage) or parallel conductors (source of constant current), the response function has a maximum in time (and accordingly by the temperature) giving the possibility for the appearance of a resistivity or conductivity peak in both the case of cooling and heating. It is also demonstrated that the existence of the spatial distribution of local inhomogeneities in the sample is equivalent to the non-uniform temporal distribution of the transition.