Abstract
Measurements of magnetization versus temperature and magnetic field have been performed on single crystals of Bi<SUB>2</SUB>Sr<SUB>2</SUB>CaCu<SUB>2</SUB>O<SUB>y</SUB> irradiated by fast electrons in temperature range from 4.2 K to 80 K and at magnetic field up to 6T. The critical current density under irradiation by fluence of 2 X 10<SUP>18</SUP> cm<SUP>-2</SUP> (E equals 4 MeV) is enhanced by 1.3 times and amounts to 1.3 X 10<SUP>6</SUP> Acm<SUP>-2</SUP> at 4.2 K and zero magnetic field (H (parallel) c). At high temperatures the dependence of the irreversibility field B<SUB>irr</SUB>(T) is described by linear expression. However, at temperature decreasing B<SUB>irr</SUB> increases very abruptly near 20 K - 30 K. For irradiated state the irreversibility line shifts towards higher magnetic fields and B<SUB>irr</SUB> changes drastically near 20 - 25 K. The results can be account for by the model of a crossover from 3D to 2D pinning.
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