Entropy Change and the Magnetocaloric Effect in R2Cu2X (X=Cd, In)

In this work, we theoretically discuss the entropy change and the magnetocaloric effect in the compounds
$Gd_{2}Cu_{2}X, Er_{2}Cu_{2}X$
and
$Tm_{2}Cu_{2}X (X= Cd, In)$
by using a model Hamiltonian with two magnetic sub-lattices. In the model, the interactions of the magnetic moments were analyzed within the framework of the mean field theory. Our theoretically calculated magnetocaloric quantities are in reasonable agreement with the experimental data available in the literature.