ON THE MAGNETIC-BEHAVIOR OF BSCCO(2223) AG TAPES

Pressed and rolled BSCCO(2223) Ag tapes have been widely characterized by SQUID magnetometry with the applied field both parallel and perpen dicular to the c-axis. The main results can be summarized as follows: (1) at low temperature (T = 5 K), the anisotropy of the in-plane and o ut-of-plane current densities J(ab)/J(c) is estimated to be 50; (2) th e magnetic response of the tapes indicates that both intergranular (tr ansport) and intragranular contributions to the magnetic moment are pr esent; (3) the samples show a strong degradation; (4) the hysteresis l oops show a certain degree of erratic behavior due to frequent jumps; (5) besides this erratic behavior, other anomalies of the hysteresis l oops are present: in particular the anomalous field position of the ma xima of the magnetization; (6) in bent samples, representing the intra granular magnetization only, all the anomalies disappear and the hyste resis loops are regular; (7) the intergranular magnetization, obtained by subtraction of the magnetic moments measured on the not-bent and b ent sample,gives a current density which is irreversible for increasin g and decreasing magnetic field, as seen also in transport measurement s.