Magnetocaloric effect in La(FexSi1−x)13La(FexSi1−x)13 doped with hydrogen and under external pressure

In this paper, we calculate the magnetocaloric effect in the compounds La(FexSi1−x)13La(FexSi1−x)13 doped with hydrogen and subjected to external pressure. We use a microscopical model where the Coulomb interaction between itinerant electrons is treated in the mean field approach. The effect of hydrogen atoms is considered as a chemical pressure. We also include phenomenologically the magnetoelastic coupling via the renormalization of the electron dispersion relation and the Debye temperature. The calculated isothermal entropy changes upon magnetic field variations for the compound La(Fe0.88Si0.12)13HyLa(Fe0.88Si0.12)13Hy are in good agreement with the available experimental data.