Magnetic field and current distributions in melt textured YBCO with an artificial grain boundary

Kenji Kawano, John Abell, AD Bradley, W Lo, D Cardwell

Research output: Contribution to journalArticle


Using a magneto-optical (MO) technique, magnetic field distributions have been measured in a melt-textured YBa2Cu3O7-x bulk superconductor. joined to form an artificial grain boundary (GB), in an external magnetic field perpendicular to the sample surface, The magnetic field at a weak section of the GB shows different values between the field increasing up to 150mT and decreasing down to 0T after zero-field-cooling. Namely, the magnetic field in increasing field is higher than that in decreasing field, even in the same external field. This result supports a model in which such differences in magnetic field at the weak-link GB give rise to the hysteresis behavior in the field dependence of transport critical current density in polycrystalline samples, The field distributions across a well-joined region of the CB behave similarly to the adjoining bulk material and this result indicates the possibility of creating useful artifacts provided that the strongly coupled sections can be reproduced on a larger scale.
Original languageEnglish
Pages (from-to)3505-3508
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number1
Publication statusPublished - 1 Mar 2001


  • hysteresis
  • Y-Ba-Cu-O bulk
  • grain boundary
  • magneto-optic


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