Abstract
Columnar defects were introduced into Bi2Sr2CaCu2O8+δ single crystals by means of high-energy heavy-ion irradiation (5.8 GeV Pb-ions). Apparent enhancement of both the hysteresis width and the irreversibility field H irr were observed after irradiation, while these were found to be closely related to the density of columnar defects. The magnetic relaxation measurements were performed at high temperature on the irradiated sample. We observed fast and non-logarithmic relaxations, which can be explained in terms of a nucleation creep model.
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