I-V CHARACTERISTICS OF SUPERCONDUCTING AG BI2SR2CA2CU3O10 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 temperatu re (4, 65, and 77 K). The magnetic field mas applied parallel and perp endicular to the face of the tape. Samples mere commercially prepared by the OPIT process. The I-V curves were analyzed by conventional mean s to extract J(C) as a function of the applied magnetic field. Some of the curves mere also fitted by an adaptation of the Ambegaokar-Halper in model from which mere obtained J(C) and the pinning potential. We f ound that, at 4 K, J(C) from both sources were generally comparable wi th J(C) similar to 10(4) A/cm(2) from 5 T to 20 T.