SIMULATION OF THE INTERGRANULAR MAGNETIZATION OF (BI,PB)(2)SR2CA2CU3O10-JUNCTION ARRAYS(X SUPERCONDUCTORS BY USING JOSEPHSON)

In this paper we present a numerical simulation study of the intergran ular magnetization of (Bi,Pb)(2)Sr2Ca2Cu3O10+x superconductors. The in tergranular-current system was modelled as a two-dimensional Josephson junction array, which consists of superconducting grains connected vi a overdamped, narrow Josephson weak links. The simulations cover magne tic-flux distribution and magnetic-hysteresis studies, including relax ation effects due to thermal fluctuations in the junctions. Special at tention was paid to the influence of intergranular defects on the arra y magnetization and intergranular (Bi,Pb)(2)Sr2Ca2Cu3O10+x. A correspo ndence with the experimental results [Paasi et al., Physica C 259(1996 ) 1) (previous paper)] required that there was an intergranular defect of the mu m order located in the middle of the four grains of an arra y mesh. Such a defect could act as a strong pinning center for intergr anular flux.