Abstract
The distribution of flux pinning energy in melt-textured growth (MTG) YBa 2 Cu 3 O 7 superconductor irradiated by fast neutrons was determined by rotating-sample magnetic measurement at liquid nitrogen temperature. It was found that neutron irradiation strengthened flux pinning by increasing the most probable pinning energy along c-axis and in ab plane by 47% and 82% respectively. Anisotropy of flux pinning was also observed. New strong pinning sites might be created by neutron irradiation.
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