Heat capacity and magnetocaloric effect in manganites (La1−yEuy)0.7Pb0.3MnO3 (y:0.2; 0.6)

Heat capacity and intensive magnetocaloric effect (MCE) in manganites (La1−yEuy)0.7Pb0.3MnO3 [y=0.2; 0.6] (LEPM) were investigated by means of adiabatic calorimeter. The heat capacity anomaly as well as the values of both the intensive (ΔTAD) and the extensive (ΔSMCE) MCE were found to decrease upon increased replacement of La with nonmagnetic Eu. However, because of widening of the MCE peaks, the LEPM compounds show the relative cooling power, RCP/ΔH, comparable to other solid solutions of manganites. Owing to strong effect of Eu→La substitution on the Curie temperature, LEPM might have potential as the solid state refrigerants in multi-element cooling apparatus operating in a wide temperature range.