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High-temperature series expansion of the Helmholtz free energy of the quantum spin-S XYZ chain

Onofre Rojas·S. M. de Souza·E. V. Corrêa Silva·M. T. Thomaz
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Abstract

We consider the $XYZ$ chain model of arbitrary spin $S$ in the high temperature region, with external magnetic field and single-ion anisotropy term. Our high-temperature expansion of the Helmholtz free energy is analytic in the parameters of the model for $S$, which may range from 1/2 to the classical limit of infinite spin ($S\to \infty$). Our expansion is carried out up to order $(J β)^5$. Our results agree with numerical results of the specific heat per site for $S=1/2$, obtained by the Bethe ansatz, with $h=0$ and D=0. Finally, we show that the magnetic susceptibility and magnetization of the quantum model can be well approximated by their classical analog in this region of temperature.

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Onofre Rojas, S. M. de Souza, E. V. Corrêa Silva, M. T. Thomaz. 2005-10-17. High-temperature series expansion of the Helmholtz free energy of the quantum spin-S XYZ chain. https://doi.org/10.1103/physrevb.72.172414

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