Abstract
The magnetization of a polycrystalline composite YBa2Cu3O7−x:Ag0.1 in the superconducting state is measured in the presence of a small a.c. magnetic field. With increase in field amplitude, the magnetizationM(t) changes its shape from nearly sinusoidal to square-wave like and then to a two-peak structure. A similar behavior of the magnetizationM(t), calculated from the critical-state model with intergranular critical currentJc=αc[μ(H0+¦H¦)]−1 is obtained. A very good fit is found between the theoretical and experimental results, and the parameters of the model are estimated.
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