MONTE-CARLO STUDY OF A KINETIC LATTICE MODEL WITH RANDOM DIFFUSION OFDISORDER

We report Monte Carlo results for a nonequilibrium Ising-like model in two and three dimensions. Nearest-neighbor interactions J change sign randomly with time due to competing kinetics. There follows a fast an d random, i.e., spin-configuration-independent diffusion of Js, of the kind that takes place in dilute metallic alloys when magnetic ions di ffuse. The system exhibits steady states of the ferromagnetic (antifer romagnetic) type when the probability p that J > 0 is large (small) en ough. No counterpart to the freezing phenomena found in quenched spin glasses occurs. We compare our results with existing mean-field and ex act ones, and obtain information about critical behavior.