CRITICAL EXPONENTS OF THE 3-DIMENSIONAL RANDOM-FIELD ISING-MODEL

The phase transition of the three-dimensional random field Ising model with a discrete (+/-h) field distribution is investigated by extensive Monte Carlo simulations. Values of the critical exponents for the correlation length, specific heat, susceptibility, disconnected susceptibility and magnetization are determined simultaneously via finite size scaling. While the magnetization appears to be discontinuous. the specific heat appears to saturate, indicating no latent heat. Sample-to-sample fluctuations of the susceptibilty are consistent with the droplet picture for the transition.