Study of magnetic transition and magnetic entropy changes of Pr0.6Sr0.4MnO3 and Pr0.6Sr0.4Mn0.9Fe0.1O3 compounds

. In the present work, we analyze the magnetic transition and magnetic entropy change of Pr 0.6 Sr 0.4 Mn 1- x Fe x O 3 samples. Using Arrott plots, we report that the phase transition for Pr 0.6 Sr 0.4 MnO 3 sample is of second order, while the Pr 0.6 Sr 0.4 Mn 0.9 Fe 0.1 O 3 sample exhibits a first-order magnetic phase transition. From the magnetization measurements at temperature close to the Curie temperature, the magnetic entropy change, and the Relative Cooling Power (RCP) have been estimated. The maximum of magnetic entropy change reaches, under an applied magnetic field of 5T, 3.58 and 3.66J/kg K for Pr 0.6 Sr 0.4 MnO 3 and Pr 0.6 Sr 0.4 Mn 0.9 Fe 0.1 O 3 , respectively. The RCP values have been estimated to 159.37 and 223.52J/kg. For both samples, the values evaluated using the Maxwell theory were found in accordance with those calculated by the Landau theory.