Study of the magnetic and magnetocaloric properties of new perovskite-type materials: La0.6Ba0.2Sr0.2Mn1−xFexO3

Abstract

In this paper, we investigated the effect of iron doping on the structural, magnetic and magnetocaloric properties of La0.6Ba0.2Sr0.2Mn1−xFexO3 (0 < x < 0.06) samples. All the samples crystallized in a rhombohedral system with \({\text{R }}\bar{3}{\text{c}}\) space group. Magnetic measurements showed that our samples undergo a FM–PM transition around the Curie temperature (Tc) which is equal to 349 K, 289 K, and 249 K for x = 0, 0.03, and 0.06, respectively. This decrease in Tc with the increase in Fe content can be related to the weakness of the Mn3+–O–Mn4+ double exchange interaction. The magnetocaloric effect was estimated by the calculation of the magnetic entropy change (\(- \;\Delta S_{{\text{M}}}^{{\max}}\)) as a function of temperature at different applied magnetic fields. The maximum values of the magnetic entropy change are found to be 2.43 J kg−1 K−1, 2.16 J kg−1 K−1, and 1.65 J kg−1 K−1 under a magnetic field of 5 T for x = 0, 0.03, and 0.06, respectively.