Abstract
In this paper we study the magnetocaloric effect in the Laves phase pseudobinary $\mathrm{Er}({\mathrm{Co}}_{1\ensuremath{-}c}{\mathrm{Ni}}_{c}{)}_{2}.$ We use a theoretical model, considering both the localized spins of rare-earth ions and the itinerant electrons of the transition elements. The two-body interactions are treated in the mean-field approach and the disorder is treated in the coherent-potential approximation. The calculated isothermal magnetic entropy and the adiabatic temperature change exhibit a good agreement with the available experimental data. We also propose a composite material, based on different samples of the pseudobinary $\mathrm{Er}({\mathrm{Co}}_{1\ensuremath{-}c}{\mathrm{Ni}}_{c}{)}_{2},$ to work as a magnetic refrigerant in the Ericsson cycle in the temperature range from 15 K to 36 K.
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