| 摘 要： | The critical currents of YBa2Cu3O7-x thin films have been measured at 74. 3K in magnetic fields up to 2.1T and at the temperature range from 64K to Tc in the absence of the field. Jc-B and Jc-T data were fitted to the flux creep model. The values of pinning energy and number density of pinning centers were obtained from the fits. The results show that the measured critical current density is flux-creep-limited and is several times smaller than Jco, the critical current density in the absence of flux creep. The distribution of pinning energies and inhomogeneity may be responsible for the discrepancy of pinning energy values obtained from different methods.
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