Journal
PHYSICAL REVIEW E
Volume 66, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevE.66.016104
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We find the exact critical temperature T-c of the nearest-neighbor ferromagnetic Ising model on an equilibrium random graph with an arbitrary degree distribution P(k). We observe an anomalous behavior of the magnetization, magnetic susceptibility and specific heat, when P(k) is fat tailed, or, loosely speaking, when the fourth moment of the distribution diverges in infinite networks. When the second moment becomes divergent, T-c approaches infinity, the phase transition is of infinite order, and size effect is anomalously strong.
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