INTRINSIC CRITICAL-CURRENT OF AG-CLAD (BI,PB)2SR2CA2CU3OZ TAPES

True zero-field critical current density J(c) of a well-characterized BPSCCO/Ag tape has been determined by means of high-resolution ac susc eptibility in the temperature range 77-110 K. The resultant values (30 ,000 A/cm2 at 77 K) agree well with the transport J(c) of the same tap e. Because of a very thin BPSCCO, the core J(c) determined from the im aginary part of the ac susceptibility is nearly the same as the zero f ield one. All J(c)'s follow the same (1 - T/T(c))n with n = 1.45 depen dence. J(c) shows an approximate H-0.5 field dependence over the explo red temperature range. Accordingly, the variations of J(c) with T and H seem to be determined by the flux creep.