Abstract
We report analytical calculations of the Helmholtz free energy of non-integrable anisotropicquantum XXZ chains in the high-temperature regime for several values of the spinS. Single-ion anisotropy and interaction with an external magnetic field are takeninto account. The seven lowest-order terms in the high-temperature expansion ofHelmholtz free energy are obtained. Our results contribute to the existing literature onhigh-temperature expansions and numerical studies of those models by discussing theeffects of anisotropy upon their high-temperature thermodynamic properties,such as the average energy per site, the specific heat and magnetic susceptibility.
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