Flux dynamic behaviour of a melt-textured YBa₂Cu₃O_7-δsample

Abstract

The flux dynamics behaviour of a melt textured YBa2Cu3O7-δ sample was studied by measuring the sweeping rate dependence of magnetization at different temperatures. First, J(T,B) curves were obtained from the extended Bean model in order to discuss the magnetization dependence on the sweeping rate. Then the curves of ln E-ln J and the thermal excited potential U0(T,B) were derived from the magnetic measurements. Thereby the magnetic response of this sample, especially the influence of the field sweeping rate to the second peak was analysed. Thus, the peak effect of this sample and the factors affecting the magnitude and position of the second peak were discussed.