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Determination of the field dependence of the intergranular critical current in a YBCO tube by horizontal traversals
Authors:S elebi  MAR LeBlanc
Institution:

aDepartment of Physics, Faculty of Science and Arts, Karadeniz Technical University, Trabzon 61080, Turkey

bDepartment of Physics, University of Ottawa, Ottawa, Ontario, Canada K1N 6N5

Abstract:The magnetic flux density in the cavity of a sintered tube of Yttrium Barium Copper Oxide (YBCO) is measured as a function of Hshort parallel, the axial magnetic field impressed and removed after zero field cooling (ZFC). We note that, in a short thick-walled hollow cylinder of a weak-linked polycrystalline high-Tc superconductor, the magnetic field in the cavity of the tube, Hz hole, rises above the applied field Hshort parallel when it is initially increasing. Consequently the standard approach to determine the critical current density from an ascending sweep of Hshort parallel alone, or a descending sweep alone cannot be exploited. However the field dependence of the intergranular critical current density Jcm can be reliably obtained from the horizontal traversals of Hz hole vs Hshort parallel. Comparison of the experimental data with model calculations for the horizontal traversals of the hysteresis curves show that the intergranular critical current density in the YBCO tube has a Kim-like field dependence. The magnetization of the grains has a significant influence on the flux density in the cavity of the tube.
Keywords:Superconducting YBCO tube  Critical current density  Return flux
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