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The commensurate-disordered phase transition in 2D classical ATNNI model studied by DMRG

A. Gendiar, A. Surda

cond-mat.stat-mecharXiv:cond-mat/0006449

Abstract

The classical two-dimensional anisotropic triangular nearest-neighbor Ising (ATNNI) model is studied by the density matrix renormalization group (DMRG) technique when periodic boundary conditions are imposed. Applying the finite-size scaling to the DMRG results a commensurate-disordered (C-D) phase transition line as well as temperature and magnetic critical exponents are calculated. We conclude that the (C-D) phase transition in the ATNNI model belongs to the same universality class as the ordered-disordered phase transition of the Ising model.

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