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Effect of Magnetic Field on Critical Current Density in Bulk Superconducting Wires

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Abstract

Bulk YBa2Cu3O7-x (YBCO) wires and tubes were fabricated by an extrusion technique. Critical current density (Jc) was measured as a function of applied magnetic field at 77 K and was found to decrease significantly in fields below 100 G. Jc was dependent on specimen geometry. In addition, when a concentric magnetic field was generated by passing a current though a copper wire, the external field from the wire could interfere constructively or destructively with the magnetic field produced by current in a YBCO tube. The change in electrical properties with magnetic field has been attributed to weak-link behavior at the grain boundaries. Batch-to-batch differences in the field dependence of Jc imply the possibility of reducing the dependence by processing modifications.

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Authors and Affiliations

  1. Argonne National Laboratory, Argonne, IL, 60439, USA

    M. T. Lanagan, U. Balachandran, C. A. Youngdahl, J. T. Dusek, J. J. Picciolo & R. B. Poeppel

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  1. M. T. Lanagan
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  2. U. Balachandran
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  3. C. A. Youngdahl
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  4. J. T. Dusek
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  5. J. J. Picciolo
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  6. R. B. Poeppel
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Lanagan, M.T., Balachandran, U., Youngdahl, C.A. et al. Effect of Magnetic Field on Critical Current Density in Bulk Superconducting Wires. MRS Online Proceedings Library 169, 1231–1234 (1989). https://doi.org/10.1557/PROC-169-1231

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  • DOI: https://doi.org/10.1557/PROC-169-1231

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