Determination of the field dependence of the intergranular critical current in a YBCO tube by horizontal traversals


Celebi S. , LeBlanc M. A. R.

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, cilt.450, ss.34-39, 2006 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 450
  • Basım Tarihi: 2006
  • Doi Numarası: 10.1016/j.physc.2006.08.001
  • Dergi Adı: PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
  • Sayfa Sayıları: ss.34-39

Özet

The magnetic flux density in the cavity of a sintered tube of Yttrium Barium Copper Oxide (YBCO) is measured as a function of H-parallel to, 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-T-c superconductor, the magnetic field in the cavity of the tube, H-z hole, rises above the applied field H-parallel to when it is initially increasing. Consequently the standard approach to determine the critical current density from an ascending sweep of H-parallel to alone, or a descending sweep alone cannot be exploited. However the field dependence of the intergranular critical current density J(cm) can be reliably obtained from the horizontal traversals of H-z hole vs H-parallel to. 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. (c) 2006 Elsevier B.V. All rights reserved.