Magnetic characterization of Ag-sheathed Bi(Pb)2223 tapes
Abstract
Ag/BPSCCO (2223) tapes were characterized by SQUID magnetometry over a wide range of temperatures (4.2-95 K) and under a magnetic field H (up to 5 T) applied either parallel or perpendicular to the c axis of the tape. For the two different field orientations, taking into account (when required) the anisotropy of the currents and demagnetization effects, the values of the critical current density 0022-3727/31/17/004/img6 were evaluated as a function of the applied magnetic field H and temperature. The magnetization decay for H perpendicular to the c axis exhibited a non-linear dependence of the flux creep activation energy on the current J. From 0022-3727/31/17/004/img7 behaviour and from the relaxation data M(t) some conclusions about dissipation mechanisms were drawn.
- Publication:
-
Journal of Physics D Applied Physics
- Pub Date:
- September 1998
- DOI:
- 10.1088/0022-3727/31/17/004
- Bibcode:
- 1998JPhD...31.2098L