MAGNETORESISTANCE AND V-I CURVES OF AG-SHEATHED (BI,PB)2SR2CA2CU3O10+Y TAPE

The magnetoresistance and the V-I curves (I > I(c)) of a well-characte rized Ag-clad (Bi,Pb)2Sr2Ca2Cu3O10+y tape (BPSCCO) with J(c)(77 K, B = 0) = 10 kA/CM2 have been analyzed in the temperature (T) range 80-1 1 0 K and magnetic field (B) up to 60 mT. The results obtained after the correction for the parallel conduction through the Ag sheathing and B PSCCO core are similar to those for corresponding single crystals and the epitaxial thin films. The effective activation energy for the flux creep U0 is larger than those for the single crystals and thin films of Bi-Sr-Ca-Cu-0 (BSCCO) compound. Tle variations of the differential resistance R(f) (deduced from V-I curves at I much greater than I(c)) with T and B are consistent with those for the conventional type-II su perconductors at elevated temperatures and low fields. Hence the unusu al features deduced from the total dissipation in similar tapes are pr obably due to improper data analysis. The analysis presented here reli es on the homogeneity of dissipation within the core which has to be c hecked for each tape.