Abstract
The magnetic relaxation of cylindrical polycrystalline samples of BiPbSrCaCuO high-TC superconductors has been measured using an inductive technique near the transition temperature. The relaxation data are analyzed by means of an interaction model based on the general theory of magnetic relaxation. This model assumes the existence of an effective energy barrier (Ueff) and considers thermal activation of the vortices over it. The pinning energy (U0) is reduced to the effective barrier Ueff=U0−Uint by the energy associated to the force of repulsion between vortices (Uint). In this work a linear dependence between the interaction energy and the susceptibility has been used, but other dependencies can easily be introduced to account for the observed nonlinearities of the U(J) curve. The model has been used to extract information of the relaxation of BiPbSrCaCuO samples at several magnetic fields and temperatures after switching off the field. A comparison with the results obtained by the Anderson–Kim model is also provided.
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