MAGNETIZATION STUDY OF HGBA2CA2CU3O8-TEMPERATURE SUPERCONDUCTOR(DELTAHIGH)

The DC susceptibility under zero-field-cooled and field-cooled conditi ons, hysteresis loop and isothermal remanent magnetization measurement s have been carried out on a powdered sample of HgBa2Ca2Cu3O8+delta. T he temperature and field dependence of the critical current density J( c) acid the pinning-force density F-p, and the irreversibility field H -irr(T) were obtained from the hysteresis loops. An exponential-like d ependence of the critical current on both temperature and applied fiel d was observed over the temperature range 85-115 K in fields up to 0.6 T. The time-dependent magnetization data were analysed within the And erson-Kim flux creep model. Derived potential barrier heights were fou nd to increase with increasing temperature over the range 85-105 K.