COMPARATIVE-STUDY ON 180 MEV CU11+ IRRADIATION EFFECT ON TEXTURED YBA2CU3OX AND BI2SR2CACU2OY

180 MeV Cu11+ irradiation was carried out on textured Y-123 tapes and the effects of irradiation on the microstructure and superconducting p roperties were investigated. The results were compared to those of Bi- 2212. The superconducting transition temperature T-c of Y-123 is much less sensitive to irradiation than that of Bi-2212. The increase of J( c) by the irradiation, J(c,) (after) (irrad.)-J(c,) (before) (irrad.), of Y-123 is comparable to that of Bi-2212 at low-temperature region. At high temperatures, on the other hand, defects introduced by the irr adiation are much more effective as pinning centers in Y-123 than thos e in Bi-2212. Flux creep was suppressed by the irradiation for both ox ides. However, essential features of flux creep were not changed by th e irradiation for both oxides. These differences in pinning behaviors between Y-123 and Bi-2212 can be understood in terms of the difference in two-dimensionality of the oxides.