Flux Pinning and Microstructure in YBa2Cu3O7

  • M. Suenaga
  • D. O. Welch
  • Youwen Xu
  • Y. Zhu
  • A. K. Ghosh
  • A. R. Moodenbaugh


Critical current densities Jc of superconductors are one of the most important properties of superconductors in the majority of applications. Unfortunately, in spite of the fact that tremendous efforts have been mounted internationally in studies of the high temperature oxide superconductors, the current values of Jc are disappointingly low except in single crystal bulk specimens and films with the current flowing in the basal planes.1,2 The majority of the studies of Jc in bulk superconductors have emphasized that the difficulties may have been due to the poor intergranular superconductivity and/or the large anisotropy in the value of Jc, depending on the orientation of the crystallographic axis with applied magnetic fields.3–5 In order to minimize this problem, Jin et al.6 and more recently Murakami et al.7 have synthesized grain-aligned bulk specimens which show values Jc (~10 A/mm2 in applied magnetic fields of a few tesla and at 77 K) significantly larger than those in the sintered materials.


Twin Boundary Critical Current Density Coherence Length Flux Line Flux Pinning 


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Copyright information

© Springer Science+Business Media New York 1990

Authors and Affiliations

  • M. Suenaga
    • 1
  • D. O. Welch
    • 1
  • Youwen Xu
    • 1
  • Y. Zhu
    • 1
  • A. K. Ghosh
    • 1
  • A. R. Moodenbaugh
    • 1
  1. 1.Materials Science Division Department of Applied ScienceBrookhaven National LaboratoryUptonUSA

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