| The critical behavior of a three-dimensional compressible
Ising
antiferromagnet under constant volume conditions is investigated by
extensive Monte Carlo simulations in the so-called semi-grand-canonical
ensamble. Elastic forces between spins are introduced by the
Stillinger-Weber potential. Energy parameters are chosen to
favorite anti-parallel spin ordering analogous to the antiferromagnetic
coupling in the Ising Hamiltonian. All the quantity analyzed
strongly indicate the system to remain in the universality class of the
standard three- dimensional Ising model, in contrast with theoretical
predictions. |
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