Abstract
Using the Monte Carlo method, weakly dilute magnetic systems described by two-dimensional five-component Potts model, which in the pure state undergoes a phase transition first order. Numerical studies have revealed that an insignificant quenched disorder, realized in the form of non-magnetic impurities, can change the order of phase transition in magnetic systems described by the two-dimensional five-component Potts model on a square lattice, for which a phase transition of the first order is observed in a homogeneous state. It is shown that such a phase change the transition is due to the fact that non-magnetic disorder prevents the coexistence of local phases characteristic of a phase transition of the first order at T = Tl .
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