Magnetization Relaxation and Resistive Behaviour of High-Tc Superconductors
From the analysis of magnetization relaxation data on various types of samples and Monte- Carlo calculations Hagen and Griessen concluded that the existing experimental data can be understood in terms of a model which incorporates a distribution m(U*) of activation energies for thermally activated flux motion. This model is extended to include flux-flow in order to reproduce the characteristic features of current-voltage curves of high-Tc superconductors. In particular the recent data of Koch et al. and Zeldov et al. can be explained without invoking a continuous phase transition (freezing into a superconducting vortex-glass phase) or a logarithmic current dependence of the activation energy.
KeywordsActivation Energy Resistive Behavior Continuous Phase Transition Large Activation Energy Dependent Activation Energy
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