The high-temperature expansion of the classical Ising model with S_z^2 term
| Autor: | Thomaz, M. T., Rojas, O. |
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| Rok vydání: | 2010 |
| Předmět: | |
| Zdroj: | Condens. Matter Phys., Vol. 15, No. 1, 13706 (2012) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.5488/CMP.15.13706 |
| Popis: | We derive the high-temperature expansion of the Helmholtz free energy up to the order \beta^{17} 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] (PF_6)_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. Comment: 10 pages, 3 figures |
| Databáze: | arXiv |
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