Abstract
Irradiation effects of fast neutron on Bi2Sr2CaCu2Oy single crystals were investigated at different fluences up to 5.8×l017cm-2. Below 1.8×1017cm-2 in neutron fluence, the changes in critical temperature(Tc) and c-axis lattice constant were relatively small, while at 5.8×1017cm-2, Tc decreased and c-axis lattice constant increased. In the low fluence region, the critical current density(Jc) calculated from the magnetization loop was enhanced in the temperature range of 4.2~60 K. After the irradiation with a fluence of 1.8×1017cm-2, the enhancement ratios were observed to be 1.05~1.3, 3~6, 200~600 and 10~100 at 4.2, 20, 40, 60 K, respectively. At 40 and 60 K, the J c enhancement ratios were much higher than that by electron irradiation with a fluence of 2.3×1018 cm-2. This suggests that the defects generated by neutron irradiation act as pinning centers more effectively than those by electron irradiation at such higher temperatures.
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