On the current transport limitations in Bi-based high temperature superconducting tapes

To¨nies, S.; Weber, H. W.; Guo, Y. C.; Dou, S. X.; Sawh, R.; Weinstein, R.
June 2001
Applied Physics Letters;6/11/2001, Vol. 78 Issue 24, p3851
Academic Journal
The transport critical current densities, J[sub c], of superconducting (Bi, Pb)[sub 2]Sr[sub 2]Ca[sub 2]Cu[sub 3]O[sub x]/Ag tapes were measured before and after employing a special radiation technique, which leaves the grain boundary properties largely unaffected. We identify two regions separated by a temperature dependent crossover field H[sub gb-p]. In the low field region, J[sub c] is limited by the transport currents across the grain boundaries, which remain unchanged after irradiation. Above H[sub gb-p], J[sub c] is limited by flux pinning. In this field region, the artificial defects optimize flux pinning and enhance J[sub c]. © 2001 American Institute of Physics.


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