Abstract
Abstract Magnetization measurement was performed on stacked samples of Bi2Sr2CaCu2O8 single crystals with magnetic field applied along the stacking direction, being parallel to the crystal c-axis. This configuration with varying sample size within the ab-plane, made possible an accurate determination of the field dependence of the critical current density Jc (∥ ab-plane) at temperatures below 30 K. However, the size-dependent magnetization hysteresis was found to vanish at higher temperatures, suggesting either a surface barrier or granularity of the crystals becomes a dominant factor for the observed irreversibility.
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