MAGNETIC CHARACTERIZATION OF MULTIFILAMENTARY BSCCO (2223)-AG TAPES

Twisted and not twisted multifilamentary BSCCO (2223)-Ag tapes, prepar ed by the PIT technique, have been characterized by SQUID magnetometry with the magnetic field applied both parallel and perpendicular to th e c-axis. From these measurements an estimation of the critical curren t densities J(ab) with Hext parallel to the c-axis, J(ab) with Hext pa rallel to the a-b, planes and J(c) is obtained. These values are in fa irly good agreement with those obtained by transport measurements. The tapes turned out to be very homogeneous and practically no difference was found in the hysteresis loops of twisted and not twisted tapes, w hich suggests that the mean grain alignment is the same in the two typ es of samples and the current path probably follows the ''brick wall'' model.