Journal article

O(n) matrix spin model with unusual critical behavior in the limit n-->

N Angelescu, M Bundaru, G Costache, CJ Thompson

Phys Rev Lett | Published : 1986


A generalized O(n) matrix version of the classical Heisenberg model, introduced by Fuller and Lenard as a classical limit of a quantum model, is solved exactly in one dimension. It is shown that even for a finite number of spins the model has a phase transition in the limit n'. The transition features a specific-heat jump, zero long-range order at all temperatures, and zero correlation length at the critical point. The Curie-Weiss version of the model is also discussed. © 1986 The American Physical Society.

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