Hamburg 2001 – scientific programme
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DY: Dynamik und Statistische Physik
DY 43: Kritische Ph
änomene und Phasenumwandlungen
DY 43.7: Talk
Thursday, March 29, 2001, 12:00–12:15, S 7
Influence of Randomness on the Phase Transition of the 3-Dimensional Potts Model — •Christophe Chatelain1, Bertrand Berche2, Wolfhard Janke1, and Pierre Emmanuel Berche3 — 1Institut für Theoretische Physik, Augustusplatz 10/11, Universität Leipzig, 04109 Leipzig — 2Laboratoire de Physique des Matériaux, Université Henri Poincaré, Nancy 1, BP 239, F-54506 Vandœuvre les Nancy Cedex, France — 3Groupe de Métallurgie Physique, Université de Rouen, F-76821 Mont Saint Aignan Cedex, France
We study the influence of random bond-dilution on the phase transition of the 3-dimensional 4-state Potts model. The pure system undergoes a strong first-order phase transition. The phase diagram is determined using large-scale Monte Carlo simulations. We present numerical evidences for the existence of a regime at strong dilution where the transition becomes continuous. We give estimates of the critical exponents in this second-order regime. In contradistinction with what has been observed for the 3-state Potts model, our estimate of the exponent ν excludes the value of the disordered Ising model universality class.