Semiclassical approach to the thermodynamics of spin chains

Details Semiclassical approach to the thermodynamics of spin chains Semiclassical approach to the thermodynamics of spin chains

1999-11-30

arxiv.org/abs/cond-mat/9911483v1

Phys. Rev. B 62, 57 (2000)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 7 figures

Scientific paper

10.1103/PhysRevB.62.57

Using the PQSCHA semiclassical method, we evaluate thermodynamic quantities of one-dimensional Heisenberg ferro- and antiferromagnets. Since the PQSCHA reduces their evaluation to classical-like calculations, we take advantage of Fisher's exact solution to get all results in an almost fully analytical way. Explicitly considered here are the specific heat, the correlations length and susceptibility. Good agreement with Monte Carlo simulations is found for S>1 antiferromagnets, showing that the relevance of the topological terms and of the Haldane gap is significant only for the lowest spin values and temperatures.

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