Magnetic field dependence of the relative critical current density in γ-irradiated polycrystalline YBa2Cu3O7 by I. M. Obaidat and F. Hamed

Crystal Research and Technology

Cryst. Res. Technol. 43, 293 (2008) - Abstract -

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

I. M. Obaidat and F. Hamed

Department of Physics, United Arab Emirates University, Al-Ain 17551, United Arab Emirates

Keywords	YBCO, grain boundaries, gamma-rays, critical current
PACS	08.15.BH
DOI	10.1002/crat.200710996

The effect of different doses of γ-rays on the behavior of the critical current density, J_c in an YBa₂Cu₃O₇ 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 J_c 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.

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