PERCOLATIVE BEHAVIOR OF TRANSPORT-PROPERTIES IN GRANULAR HIGH-T(C) SUPERCONDUCTORS

A new model based on percolative computation directly performed for an array system of Josephson junctions is reported. The number of percolative paths is obtained and the total critical current of the model system is estimated from 2D and 3D arrays at selected values of external magnetic field. The evolution of the critical current distribution of the junctions at increasing magnetic field is studied in view of the relevance in percolative path calculations and compared with the experimental distribution obtained from I - V characteristics. Percolative simulation results are shown to reproduce more satisfactory experimental critical current behavior in external magnetic fields, obtained in highly porous thick YBa2Cu3O7-x films electrophoretically deposited than mere statistical averages.