Abstract
The influence of Josephson junction array on the dynamical current-voltage anomalies and magnetic properties of high temperature ceramic superconductors is analyzed. The influence of vortices penetrating the junction regions on the macroscopic current flowing through the sample is considered. In the case of zero transport current the existence of vortices modifies the magnetic field dependence of the screening currents and such magnetic properties as the shape of magnetization curves. In the case of transport current flow the existence of junctions may lead to a new critical state approach the consequences of which are anomalies of the dynamical current-voltage characteristics. Comparison of the theoretical model predictions with experimental data measured on high temperature ceramics of various composition is made.
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