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

Published online by Cambridge University Press:  28 February 2011

M. T. Lanagan ,
U. Balachandran ,
C. A. Youngdahl ,
J. T. Dusek ,
J. J. Picciolo  and
R. B. Poeppel
M. T. Lanagan
Affiliation:
Argonne National Laboratory, Argonne, IL 60439
U. Balachandran
Affiliation:
Argonne National Laboratory, Argonne, IL 60439
C. A. Youngdahl
Affiliation:
Argonne National Laboratory, Argonne, IL 60439
J. T. Dusek
Affiliation:
Argonne National Laboratory, Argonne, IL 60439
J. J. Picciolo
Affiliation:
Argonne National Laboratory, Argonne, IL 60439
R. B. Poeppel
Affiliation:
Argonne National Laboratory, Argonne, IL 60439
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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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 169: Symposium M – High Temperature Superconductors: Fundamental Properties and Novel Materials Processing , 1989 , 1231
Copyright
Copyright © Materials Research Society 1990

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