Abstract
Change in critical current density of Bi 2Sr 2CaCu 2O 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 5×10 11 cm −2 for both Au ions and Ag ions, the specimens were annealed in air. Different annealing time dependencies of critical current density ( J c) 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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