Abstract
The single-cluster Monte Carlo algorithm and the reweighting technique
are used to simulate the 3D ferromagnetic Ising model on 3D
Voronoi-Delauney lattices. It is assumed that the coupling factor J
varies with the distance r between the first neighbors as J(r) alpha e(-ar), with a >= 0. The critical exponents gamma/nu, beta/nu, and nu
are calculated, and according to the present estimates for the critical
exponents, we argue that this random system belongs to the same
universality class of the pure 3D ferromagnetic Ising model. (c) 2007
Elsevier B.V. All rights reserved.
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