Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2000-08-18
Eur. Phys. J. B 17 (2000) 111-114
Physics
Condensed Matter
Statistical Mechanics
3 pages, 5 figures
Scientific paper
10.1007/s100510070165
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 $\gamma$ and $\nu$ which are different from the respective exponents of the three-state Potts model on a regular square lattice. However, the ratio $\gamma/\nu$ 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 $a=1.0$
Almeida Marcelo P.
Andrade Jose S. Jr.
Costa U. M. S.
Lima Welington F. S.
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