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

Publishing date

1998-05-18

URL

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

Journals

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

Science

Physics

Field

Condensed Matter

Additional info

10 pages, 3 figures

Type

Scientific paper

Digital Object Identifier

10.1103/PhysRevLett.81.216

Abstract

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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