UNIVERSALITY CLASS FOR DOMAIN GROWTH IN RANDOM MAGNETS

A 2D Ising model with random ferromagnetic bonds is studied by Monte Carlo simulation following a quench from T = infinity to T < T(c). The domain size grows as L(t) approximately (ln t/t0)x at late times. The data are consistent with the theoretical prediction x = 4. The exponent lambdaBAR, defined by <S(i)(0)S(i)(t)> approximately L(t)-lambdaBAR, and the scaling functions for the spatial correlations, are very close to those of the pure system, suggesting that pure and random systems belong to the same universality class.