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cond-mat1998
The limit of O(n) model on graphs
Raffaella Burioni, Davide Cassi, Claudio Destri
Thirty years ago, Stanley showed that an O(n) spin model on a lattice tends to a spherical model as . This means that at any temperature the corresponding free energies…
cond-mat.stat-mech1998
Magnetization bound for classical spin models on graphs
Raffaella Burioni, Davide Cassi, Alessandro Vezzani
In this paper we prove the existence of phase transitions at finite temperature for O(n) classical ferromagnetic spin models on infrared finite graphs. Infrared finite graphs are i…