Hysteresis in transport critical-current measurements of oxide superconductors

We have investigated hysteresis in transport critical-current (I/sub c/) measurements of Ag-matrix (Bi,Pb)/sub 2/Sr/sub 2/-Ca/sub 2/Cu/sub 3/O/sub 10-x/ (Bi-2223) and AgMg-matrix Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8+x/ (Bi-2212) tapes. I/sub c/ hysteresis causes measurements with field, angle, and temperature sweeps to be multi-valued. Which value is correct is addressed in the context that the proper sequence of measurement conditions reflects the application conditions. Hysteresis in angle-sweep and temperature-sweep data is related to field-sweep hysteresis.