Transport and AC susceptibility critical currents in Ag sheathed Bi(Pb)2223 tapes

Transport and AC susceptibility measurements have been performed in Ag sheathed Bi(Pb)2223 tapes. The complex susceptibility (chi' + i chi ''), has been measured as a function of temperature for various applied fields. From the chi ''(T) curves the values of the magnetic critical current density have been inferred via the application of Bean's critical-state model and a comparison with the corresponding transport values has been made. The agreement between the two sets of data is rather good, confirming that, for the examined tapes, Bean's field-independent assumption is not too far from the sample's actual state.