Theoretical investigation of direct and inverse magnetocaloric effect in La2FeMn1-xCuxO6 and Sr2RuMn1-xFexO6 using a phenomenological model

This letter presents a theoretical work on magnetocaloric properties of two series of double perovskites compounds La2FeMn1-xCuxO6 and Sr2RuMn1-xFexO6 with four different concentrations (x = 0, 0.1, 0.2 and 0.3) synthesized by solid state method. The value of the magnetocaloric effect (MCE) of both the series has been predicted by applying a phenomenological model on temperature variation magnetization data of the compounds. Along with the maximum entropy change (- Delta Sm)max, specific heat and relative cooling power (RCP) were also calculated using the model. Interestingly, the simulated MCE of Fe doped Sr2RuMnO6 (Sr2RuMn1xFexO6) showed the coexistence of direct and inverse MCE.