Magnon dispersion and thermodynamics in CsNiF_3

Details Magnon dispersion and thermodynamics in CsNiF_3 Magnon dispersion and thermodynamics in CsNiF_3

2000-11-29

arxiv.org/abs/cond-mat/0011496v1

Phys. Rev. B 63, 224406 (2001)

Physics

Condensed Matter

Statistical Mechanics

9 pages 10 figures

Scientific paper

10.1103/PhysRevB.63.224406

We present an accurate transfer matrix renormalization group calculation of the thermodynamics in a quantum spin-1 planar ferromagnetic chain. We also calculate the field dependence of the magnon gap and confirm the accuracy of the magnon dispersion derived earlier through an 1/n expansion. We are thus able to examine the validity of a number of previous calculations and further analyze a wide range of experiments on CsNiF_3 concerning the magnon dispersion, magnetization, susceptibility, and specific heat. Although it is not possible to account for all data with a single set of parameters, the overall qualitative agreement is good and the remaining discrepancies may reflect departure from ideal quasi-one-dimensional model behavior. Finally, we present some indirect evidence to the effect that the popular interpretation of the excess specific heat in terms of sine-Gordon solitons may not be appropriate.

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