Abstract
The superconducting transition of single-crystal YBa 2Cu 3O y thin films (1000–6000 Å) was measured in terms of harmonic susceptibilities X n = X n ′−i X n ″ ( n=1, 3, 5, 7). A weak AC field (0.01−0.1 mT) was applied perpendicular to the film planes. The observed nonlinear magnetic response as a function of temperature was analyzed within the framework of modified Bean's model, Kim-Anderson's model and Ishida-Mazaki's model. It has been revealed that the calculated curves by the modified Bean model are in good agreement with the observed ones, but the other two models are not successful in reproducing the experimental observations. This result suggests that, for thin film located perpendicular to the applied AC magnetic field, both the bulk-pinning effect and the surface barrier play an essential role in the magnetic response.
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