Critical Behavior of a 2D Spin-Pseudospin Model in a Strong Exchange Limit

D. Yasinskaya, V. Ulitko, A. Chikov, Yu. Panov Ural Federal University 620002, 19 Mira Str., Ekaterinburg, Russia

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We study the 2D static spin-pseudospin model equivalent to the dilute frustrated antiferromagnetic Ising model with charge impurities. We present the results of classical Monte Carlo simulation on a square lattice with periodic boundary conditions in a ``strong'' exchange limit. In the framework of the finite-size scaling theory we obtained the static critical exponents for the specific heat α and the correlation length ν for a wide range of the local density-density interaction parameter Δ and charge density n. It was shown that the system exhibits non-universal critical behavior depending on these parameters.

DOI:10.12693/APhysPolA.137.979 topics: Monte Carlo, critical behavior, frustration, pseudospin, dilute Ising model, universality-nonuniversality crossover