Abstract
In the present research work, a phenomenological model is applied to describe the magnetocaloric effect of the La0.57Nd0.1Sr0.13Ag0.2MnO3 system near a second-order phase transition from ferromagnetic to paramagnetic state. Based on this model, the values of the magnetocaloric properties are predicted from the calculation of magnetization as a function of temperature under different external magnetic fields. The maximum magnetic entropy change ( $$ - \Delta S_{\text{M}}^{\mathrm{max} } $$ ) and the relative cooling power are found to be, respectively, 1.51 J kg−1 K−1 and 71.96 J kg−1 for H = 2T, making this material a suitable candidate for magnetic refrigeration applications. The magnetic entropy change ΔS has been determined using the Landau theory consistent with the experimental ones. A master curve of the magnetic entropy change confirmed the second order of the magnetic phase transition.
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