Magnetic models on Apollonian networks

Details Magnetic models on Apollonian networks Magnetic models on Apollonian networks

2004-11-14

arxiv.org/abs/cond-mat/0411364v1

Physics

Condensed Matter

Statistical Mechanics

21 pages, 5 figures

Scientific paper

10.1103/PhysRevE.71.056131

Thermodynamic and magnetic properties of Ising models defined on the triangular Apollonian network are investigated. This and other similar networks are inspired by the problem of covering an Euclidian domain with circles of maximal radii. Maps for the thermodynamic functions in two subsequent generations of the construction of the network are obtained by formulating the problem in terms of transfer matrices. Numerical iteration of this set of maps leads to exact values for the thermodynamic properties of the model. Different choices for the coupling constants between only nearest neighbors along the lattice are taken into account. For both ferromagnetic and anti-ferromagnetic constants, long range magnetic ordering is obtained. With exception of a size dependent effective critical behavior of the correlation length, no evidence of asymptotic criticality was detected.

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