CLUSTER-SIZE STATISTICS OF SITE-BOND-CORRELATED PERCOLATION MODELS

We consider the cluster-size statistics of two types of site-bond-corr elated percolation. In model A (B) [see Phys. Rev. B 40, 10 986 (1989) ], the activation of a bond between two first-neighbor occupied sites is also dependent on the occupancy of both (either) of their own neare st neighbors, along the line joining them. The critical concentration for models A and Bt obtained from simulations on square lattices of si zes up to 2000x2000, is found to be 0.7405+/-0.0005 and 0.6145+/-0.000 5, respectively. The resulting critical exponents indicate that both m odels are in the same universality class as ordinary independent (site or bond) percolation.