DYNAMIC SCALING OF DISORDERED ISING SYSTEMS

The critical dynamics of site-disordered three-dimensional Ising systems has been studied by conventional local dynamics simulations investing 10(15) single spin flips. We have verified that the correlation functions of disordered Ising systems obey dynamic scaling behaviour. The dynamic scaling functions have been calculated. The critical exponent z appears to be strongly dependent on the degree of disorder. We have shown that this dependence arises from a crossover phenomenon which has recently been detected in the static critical behaviour. The dynamical exponent has been estimated to be z = 2.4 +/- 0.1 which is surprisingly near to the renormalization group result in O(epsilon1/2).