MAGNETIC-FIELD IN THE VICINITY OF BSCCO TAPES CARRYING TRANSPORT CURRENT

Measurements of magnetic field components B-x,B-y,B-z, produced by both shielding and transport currents in BSCCO/Ag tapes are presented. The measured sample BSCCO 2223 was prepared by the powder in tube technique and the self field critical current densities were of the order of 10(4) A/cm(2) at 77 K. The shielding currents were induced by the external magnetic field perpendicular to the tape surface. The sample magnetic field was measured using 3 Hall probes with small active area (about 10(-2) and mm(2)) and sensitivity of the order of 10mV/T. They were fixed to a special holder so that they sense x, y and z component of the sample magnetic field at the distance greater than or equal to 0.5mm from the sample surface. The measured profiles provide information on the critical current density inhomogeneities along the sample as well as on the spatial and time distribution of both transport and magnetization currents.