Thermodynamic properties of a diluted Heisenberg ferromagnet with interaction anisotropy -- magnetocaloric point of view

Abstract

The thermodynamics of a site-diluted ferromagnetic Heisenberg model for spin $S=1/2$ with interaction anisotropy in spin space is investigated. The study is aimed at presenting the magnetocaloric properties of such a model, including the entropy and temperature changes in magnetization/demagnetization processes, generalized Grüneisen ratio as well as the quantities characterizing the efficiency of magnetic cooling cycles. The results are obtained using Pair Approximation (PA) method and extensively compared with the Molecular Field Approximation (MFA) calculations. The importance of interaction anisotropy and site-dilution is discussed. The inadequacy of the MFA approach (even on the qualitative level) is found for selected quantities, while PA provides the results which are consistent with the experimentally observed behaviour.

References in corpus (5)

• Magnetocaloric effect in one-dimensional antiferromagnets
• Magnetocaloric effect in the frustrated square lattice J1-J2 model
• Magnetocaloric effect in two-dimensional spin-1/2 antiferromagnets
• Computer simulation of the critical behavior of 3D disordered Ising model
• Magneto-thermal properties of the spin-s Heisenberg antiferromagnet on the cuboctahedron

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• The Pair Approximation method for the ferromagnetic Heisenberg model with spin $S=1$ and arbitrary range of interactions. Application for the magnetic semiconductor CrIAs
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• Study of thermodynamic properties of substitutional mixture of Co(II)- and Fe(II)-based octacyanoniobates