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DY: Dynamik und Statistische Physik

DY 26: Ising models

DY 26.1: Talk

Tuesday, March 25, 2003, 17:15–17:30, G\"OR/226

Phase transitions of the diluted 3D 4-state Potts model — •Wolfhard Janke², Christophe Chatelain¹, Bertrand Berche¹, and Pierre Emmanuel Berche³ — ¹Laboratoire de Physique des Matériaux, Université Henri Poincaré, Nancy 1, BP 239, F-54506 Vandœuvre les Nancy Cedex, France — ²Institut für Theoretische Physik, Universität Leipzig, Augustusplatz 10/11, 04109 Leipzig, Germany — ³Groupe de Physique des Matériaux, Université de Rouen, F-76821 Mont Saint-Aignan Cedex, France

By large-scale Monte Carlo simulations we have studied the phase diagram of the bond-diluted three-dimensional 4-state Potts model. Evidences are given for the existence of a tricritical point separating a regime where the transition remains of first order and a second-order regime where the transition is smoothed to a continuous one by the quenched disorder. In the latter regime, critical exponents are estimated.