Measurements of magnetization versus temperature and magnetic field have been performed on single crystals of Bi₂Sr₂CaCu₂O_y 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 10¹⁸ cm^-2 (E equals 4 MeV) is enhanced by 1.3 times and amounts to 1.3 X 10⁶ Acm^-2 at 4.2 K and zero magnetic field (H (parallel) c). At high temperatures the dependence of the irreversibility field B_irr(T) is described by linear expression. However, at temperature decreasing B_irr increases very abruptly near 20 K - 30 K. For irradiated state the irreversibility line shifts towards higher magnetic fields and B_irr changes drastically near 20 - 25 K. The results can be account for by the model of a crossover from 3D to 2D pinning.

Date Published: 24 March 1999
PDF: 4 pages
Proc. SPIE 3724, International Conference on Solid State Crystals '98: Single Crystal Growth, Characterization, and Applications, (24 March 1999); doi: 10.1117/12.343012

Published in SPIE Proceedings Vol. 3724:
International Conference on Solid State Crystals '98: Single Crystal Growth, Characterization, and Applications
Andrzej Majchrowski; Jerzy Zielinski, Editor(s)