Title :
Comparing powder magnetization and transport critical current of Bi,Pb(2223) tapes
Author :
Dhallé, M. ; van der Laan, D.C. ; van Eck, H.J.N. ; Vargas, L. ; Ten Haken, B. ; ten Kate, H.H.J. ; Trociewitz, U.P. ; Schwartz, J.
Author_Institution :
Dept. Appl. Phys., Univ. of Twente, Enschede, Netherlands
fDate :
6/1/2003 12:00:00 AM
Abstract :
The magnetic field dependence of the critical current in (Bi,Pb)2Sr2Ca2Cu3O10+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.
Keywords :
bismuth compounds; calcium compounds; critical current density (superconductivity); high-temperature superconductors; lead compounds; magnetisation; strontium compounds; superconducting tapes; (Bi,Pb)2Sr2Ca2Cu3O10+x; (BiPb)2Sr2Ca2Cu3O10+x; 50 K; Bi,Pb(2223) tapes; high temperature superconductor; irreversibility field; isolated grains; low-field behavior; magnetic field dependence; magnetization response; parallel-path picture; powder magnetization; transport critical current; Bismuth; Critical current; Grain boundaries; Laboratories; Magnetic field measurement; Magnetic fields; Magnetic flux; Magnetization; Powders; Strontium;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2003.812520
