Classical critical behavior of spin models with long-range interactions

Details Classical critical behavior of spin models with long-range interactions Classical critical behavior of spin models with long-range interactions

1997-04-02

arxiv.org/abs/cond-mat/9704016v2

Phys. Rev. B 56, 8945 (1997)

Physics

Condensed Matter

Statistical Mechanics

20 pages RevTeX, 9 PostScript figures. Uses epsf.sty. Corrected scaling analysis at the upper critical dimension, in particula

Scientific paper

10.1103/PhysRevB.56.8945

We present the results of extensive Monte Carlo simulations of Ising models with algebraically decaying ferromagnetic interactions in the regime where classical critical behavior is expected for these systems. We corroborate the values for the exponents predicted by renormalization theory for systems in one, two, and three dimensions and accurately observe the predicted logarithmic corrections at the upper critical dimension. We give both theoretical and numerical evidence that above the upper critical dimension the decay of the critical spin-spin correlation function in finite systems consists of two different regimes. For one-dimensional systems our estimates for the critical couplings are more than two orders of magnitude more accurate than existing estimates. In two and three dimensions we give, to our knowledge, the first results for the critical couplings.

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