Abstract
A generalized 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 . 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.
- Received 8 October 1985
DOI:https://doi.org/10.1103/PhysRevLett.56.1526
©1986 American Physical Society