The energy spectrum and thermodynamics of one dimensional spin models for ferrimagnets on the base of transition metal complexes

doi:10.26565/2220-637X-2013-22-02

Victor V. Tokarev V.N. Karazin Kharkiv National University
Vladislav O. Cheranovsky V.N. Karazin Kharkiv National University https://orcid.org/0000-0002-2255-400X

DOI: https://doi.org/10.26565/2220-637X-2013-22-02

Keywords: molecular magnets, Heisenberg model with single-ion anisotropy

Abstract

In frame of Heisenberg and Ising models with single-ion anisotropy the numerical calculations of the temperature dependencies of magnetic susceptibility and the field dependencies of magnetization for the fragment of alternating spin chain formed by 5 unit cells, containing spins s₁ = 1/2 and s₂ = 1, have been performed at different values of anisotropy parameter D. On the base of these calculations it has been shown that the Ising model describes qualitatively correct the magnetic characteristics of the corresponding Heisenberg model at small values of single-ion anisotropy parameter and the temperature T > D/k_B.

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