I-V characteristics of superconducting Ag/Bi/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub 10/ tapes

We have measured the current-voltage (I-V) characteristics of Ag-clad BiSrCaCuO tapes as a function of magnetic field (0-20 T) and temperature (4, 65, and 77 K). The magnetic field was applied parallel and perpendicular to the face of the tape. Samples were commercially prepared by the OPIT process. The I-V curves were analyzed by conventional means to extract J/sub c/ as a function of the applied magnetic field. Some of the curves were also fitted by an adaptation of the Ambegaokar-Halperin model from which were obtained J/sub c/ and the pinning potential. We found that, at 4 K, J/sub c/ from both sources were generally comparable with J/sub c/ /spl sim/10/sup 4/ A/cm/sup 2/ from 5 T to 20 T.<>