The effects of the distribution of bimodal bonds on phase transition in 2DPotts model

We have studied the q=8 state Potts model in two dimension to determine the effects of the distribution of bimodal bonds on the phase transition. We h ave shown that, by monitoring the energy histograms and autocorrelation tim es, there exist a finite size-dependent threshold value of the introduced q uenched bond randomness for rounding the first-order phase transition and t his threshold value becomes smaller as the system size increased. (C) 1999 Elsevier Science B.V. All rights reserved.