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Flux Creep in Superconductors in Terms of an Activation Energy Spectrum of Randomly Distributed Pinning Centres

A model for magnetic relaxation in superconductors is developed which takes into account a distribution of activation energies without the assumption of a domain structure. The predictions are fully quantitative for a Gaussian distribution and qualitative for more general distributions. The model is compared with others, and experiments which could decide which is the most appropriate for the description of high-Tc superconductors are proposed.