Comparing powder magnetization and transport critical current of Bi,Pb(2223) tapes


Dhallé, M. and Laan, D.C. van der and Eck, H.J.N. van and Vargas, L.D. and Haken, B. ten and Kate, H.H.J. ten and Trociewitz, U.P. and Schwartz, J. (2003) Comparing powder magnetization and transport critical current of Bi,Pb(2223) tapes. IEEE transactions on applied superconductivity, 13 (2). pp. 3702-3705. ISSN 1051-8223

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Abstract:The magnetic field dependence of the critical current in (Bi,Pb)/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub 10+x/ tapes is compared with the magnetization response of isolated grains extracted from the tapes. Special attention is paid to the low-field behavior. The goal of the experiment is to test the widely-used hypothesis that current paths in these tapes contain both weak- and strong- linked branches, which in low field act in parallel. The data agree with this hypothesis; at temperatures above 50 K the powder magnetization drops off exponentially from the self-field to the irreversibility field, while the transport and magnetization currents in the intact tapes show an extra low-field component. Below 50 K the powder behavior becomes less straightforward, but the parallel-path picture in the tapes still holds.
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Copyright:©2003 IEEE
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