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Physica A Statistical Mechanics and its Applications

Phase transitions in a disordered extended Hubbard model and in the random field Blume-Capel model

R. Micnas, K. A. Chao, S. Robaszkiewicz

Published Sep 1, 1985• 7 citations
Publisher
DOI
10.1016/0378-4371(85)90024-x

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We present an extensive study of the effects of quenched disorder on the dynamic phase transitions of kinetic spin models in two dimensions. We undertake a numerical experiment performing Monte Carlo simulations of the square-lattice random-bond Ising and Blume-Capel models under a periodically oscillating magnetic field. For the case of the Blume-Capel model we analyze the universality principles of the dynamic disordered-induced continuous transition at the low-temperature regime of the phase diagram. A detailed finite-size scaling analysis indicates that both nonequilibrium phase transitions belong to the universality class of the corresponding equilibrium random Ising model.