Magnetic field dependence of the relative critical current density in γ-irradiated polycrystalline YBa2Cu3O7

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Abstract

The effect of different doses of γ-rays on the behavior of the critical current density, Jc in an YBa2Cu 3O7 polycrystalline sample has been investigated at high temperatures. The samples were irradiated at room temperature by a 60Co γ-ray source at a dose rate of 0.5 MR/h. Jc was found to increase significantly with after irradiation dose of 10 MR. Further irradiation dose of 50 MR produced a slight and field dependent enhancement of Jc above its values at 10 MR. The most interesting result is that the relative change in the critical current density was found to have a non-monotonic behavior with the applied magnetic field. These results are discussed in terms of the roles of several mechanisms created by γ-rays in the regions of the grain boundaries combined with the effect of the magnetic field on these mechanisms.

Original languageEnglish
Pages (from-to)293-296
Number of pages4
JournalCrystal Research and Technology
Volume43
Issue number3
DOIs
Publication statusPublished - Mar 1 2008

Keywords

  • Critical current
  • Grain boundaries
  • YBCO
  • γ-rays

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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