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A study of dissipation mechanisms in high-Tc superconductors

Magnetic losses and time dependence of magnetization for high-Tc polycrystalline samples are being investigated. From magnetization data the flux-density-profile and critical-state-model parameters are obtained. The critical-state model has been modified to include the observed time dependence of magnetization which is described in terms of thermally activated flux-flow theory. The field and temperature dependences of the creep rate and the activation energy have been found and are discussed.