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

Abstract

The effect of different doses of γ-rays on the behavior of the critical current density, J c in an YBa 2 Cu 3 O 7 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. J c 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.

The influence of Pb‐ion irradiation on melt‐textured YBa2Cu3Ox crystals

“…Since the critical current density J c , is crucially important in the applications of HTSCs, huge scientific research have been conducted to optimize J c values. Introducing artificial pinning centers in the HTSCs using several types of energetic radiations was found to be very successful in increasing the vortex pinning forces [2][3][4][5][6][7][8][9]. Irradiating the HTSCs by heavy ions creates extended structural (columnar) defects in the material.…”

Effects of Gamma Ray Irradiation on High Temperature Superconductors YBCO with Nanoparticles Fe₃O₄ Addition

“…It is known that gamma rays produce ionization in solids. Many works were carried out about the effects of gamma ray irradiation on the properties of superconductors in the past [16,17,18,19,20,21].…”