engleski

Scaling of J_c-B curves in BSCCO/Ag tapes

Critical current density J(c) of high-J(c), Ag-clad Bi2Sr2CaCu2O8+x and (Bi, Pb)(2)Sr(2)Ca(2)Cu(3)0(10+y) tapes has been studied in the temperature (T) range 4.5-92K and magnetic field B less than or equal to 1 T. Both types of tapes exhibit clear scaling of J(c) and the pinning force density F-p = J(c)B with B for T/T-c > 0.4. The scaling field B* (F-p reaches its maximum for B = B*) shows an exp(-T/T-0) variation with T-0 approximate to 11 K for T/T-c < 0.8. The implications of these results for the understanding of J(c) in high-(Tc) superconductors and the practical applications of BSCCO/Ag tapes are briefly discussed.

high T_c superconductors ; flux pinning and creep

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