GENERATION OF JC(HE) HYSTERESIS CURVES FOR GRANULAR YBA2CU3O7-DELTA SUPERCONDUCTORS

The experimental hysteretic behaviour of the transport critical current density J(c)(H(e)) observed in granular YBa2Cu3O7-delta has been compared with the analogous theoretical curves resulting from a well known model based on the effect of flux trapped by the superconducting grains at the intergranular junctions. The magnetization of the grains was calculated for different values of maximum applied field Hm using the Bean model; at the same time the statistical distribution of the qualities of the junctions was taken into account. This approach was seen to predict the evolution of hysteretic J(c)(H(e)) curves for different values of H(m) with reasonable accuracy.