%0 Journal Article
%T The high-temperature expansion of the classical Ising model with Sz2 term
%A M.T. Thomaz
%A O. Rojas
%J Condensed Matter Physics
%D 2012
%I Institute for Condensed Matter Physics
%X We derive the high-temperature expansion of the Helmholtz free energy up to order ¦Â17 of the one-dimensional spin-S Ising model, with single-ion anisotropy term, in the presence of a longitudinal magnetic field. We show that the values of some thermodynamical functions for the ferromagnetic models, in the presence of a weak magnetic field, are not small corrections to their values with h=0. This model with S=3 was applied by Kishine et al. [J.-i. Kishine et al., Phys. Rev. B, 2006, 74, 224419] to analyze experimental data of the single-chain magnet [Mn (saltmen)]2 [Ni(pac)2 (py)2] (PF6)2 for T<40 K. We show that for T<35 K the thermodynamic functions of the large-spin limit model are poor approximations to their analogous spin-3 functions.
%K quantum statistical mechanics
%K one-dimensional Ising model
%K spin-S models
%K large-spin limit Ising model
%K single-chain magnets
%U http://dx.doi.org/10.5488/CMP.15.13706