English

Ising model on a $restricted$ scale-free network

Statistical Mechanics 2023-05-24 v1

Abstract

The Ising model on a restrictedrestricted scale-free network (SFN) has been studied employing Monte Carlo simulations. This network is described by a power-law degree distribution in the form P(k) kαP(k)~k^{-\alpha}, and is called restricted, because independently of the network size, we always have fixed the maximum kmk_{m} and a minimum k0k_{0} degree on distribution, being that for it, we only limit the minimum network size of the system. We calculated the thermodynamic quantities of the system, such as, the magnetization per spin mL\textrm{m}_{\textrm{L}}, the magnetic susceptibility χL\chi_{\textrm{L}}, and the reduced fourth-order Binder cumulant UL\textrm{U}_{\textrm{L}}, as a function of temperature TT for several values of lattice size NN and exponent 1α51\le\alpha\le5. For the values of α\alpha, we have obtained the finite critical points due to we also have finite second and fourth moments in the degree distribution, and the phase diagram was constructed for the equilibrium states of the model in the plane TT versus k0k_{0}, kmk_{m}, and α\alpha, showing a transition between the ferromagnetic FF to paramagnetic PP phases. Using the finite-size scaling (FSS) theory, we also have obtained the critical exponents for the system, and a mean-field critical behavior is observed.

Keywords

Cite

@article{arxiv.2303.09781,
  title  = {Ising model on a $restricted$ scale-free network},
  author = {R. A. Dumer and M. Godoy},
  journal= {arXiv preprint arXiv:2303.09781},
  year   = {2023}
}

Comments

9 pages, 8 figures and 2 tables

R2 v1 2026-06-28T09:21:01.690Z