Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2003-06-02
Phys. Rev. E 68, 027101 (2003)
Physics
Condensed Matter
Statistical Mechanics
Scientific paper
10.1103/PhysRevE.68.027101
We study the collective behavior of an Ising system on a small-world network with the interaction $J(r) \propto r^{-\alpha}$, where $r$ represents the Euclidean distance between two nodes. In the case of $\alpha = 0$ corresponding to the uniform interaction, the system is known to possess a phase transition of the mean-field nature, while the system with the short-range interaction $(\alpha\to\infty)$ does not exhibit long-range order at any finite temperature. Monte Carlo simulations are performed at various values of $\alpha$, and the critical value $\alpha_c$ beyond which the long-range order does not emerge is estimated to be zero. Thus concluded is the absence of a phase transition in the system with the algebraically decaying interaction $r^{-\alpha}$ for any nonzero positive value of $\alpha$.
Choi Min-Young
Hong Hanjing
Jeong Daun
Kim Beom Jun
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