i Influence of quenched nonmagnetic impurities on phase transitions in two-dimensional 3-state antiferromagnetic Potts model on triangular latiice

摘要

An influence of quenched nonmagnetic disorder on the phase transitions in the two dimensional antiferromagnetic Potts model with a number of spin stateq-3 on a triangulaor latticc is calculated by the Monte-Carlo method. The systems with linear sizes L=20+144 at spin concentrations p=1.00, 0.90, 0.80 are studied. By means of the fourth order Binder cumulant method, the inclusion of a quenched disorder as nonmagnetic impurities into a pure antiferromagnetic Potts model is shown to be the cause of the change of the first order phase transition into the second one.