Periodic Instantons and Quantum-Classical Transitions in Spin Systems

Details Periodic Instantons and Quantum-Classical Transitions in Spin Systems Periodic Instantons and Quantum-Classical Transitions in Spin Systems

1998-05-18

arxiv.org/abs/cond-mat/9805209v1

Phys.Rev.Lett. 81 (1998) 216-219

Physics

Condensed Matter

10 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.81.216

Some models allowing explicit calculation of periodic instantons and evaluation of their action are studied with regard to transitions from classical to quantum behaviour as the temperature is lowered and tunneling sets in. It is shown that (beyond a critical value of a coupling) the spin system considered acquires a first order transition as a result of the field dependence of its effective mass, whereas models with constant mass exhibit only second order transitions.

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