Abstract
Change in critical current density of Bi 2 Sr 2 CaCu 2 O 8+x (Bi-2212) single crystals due to high-energy heavy-ion (200 MeV Au or 200 MeV Ag) irradiation followed by thermal annealing treatment was investigated. After irradiation at the fluence of 5 x 10 11 cm -2 for both Au ions and Ag ions, the specimens were annealed in air. Different annealing time dependencies of critical current density (Jc) were observed between the measurement temperatures of 20 and 40 K for both Au- and Ag-irradiated specimens. J c gradually decreased with the increase of annealing time at 20 K. On the other hand, it gradually increased at 40 K. Such different dependencies of J c are considered to be attributed to the different kind of defects that contribute dominantly to the pinning effect at each temperature.
Published Version
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