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Critical Behavior of a Three-State Potts Model on a Voronoi Lattice

F. W. S. Lima·U. M. S. Costa·M. P. Almeida·J. S. Andrade Jr
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Abstract

We use the single-histogram technique to study the critical behavior of the three-state Potts model on a (random) Voronoi-Delaunay lattice with size ranging from 250 to 8000 sites. We consider the effect of an exponential decay of the interactions with the distance,$J(r)=J_0\exp(-ar)$, with $a>0$, and observe that this system seems to have critical exponents $γ$ and $ν$ which are different from the respective exponents of the three-state Potts model on a regular square lattice. However, the ratio $γ/ν$ remains essentially the same. We find numerical evidences (although not conclusive, due to the small range of system size) that the specific heat on this random system behaves as a power-law for $a=0$ and as a logarithmic divergence for $a=0.5$ and $a=1.0$

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F. W. S. Lima, U. M. S. Costa, M. P. Almeida, J. S. Andrade Jr. 2000-08-18. Critical Behavior of a Three-State Potts Model on a Voronoi Lattice. https://doi.org/10.1007/s100510070165

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