Heat capacities of (Ca,Ln)MnO3 (Ln=Pr, Nd and Sm)

Abstract Heat capacities of Ca x Ln 1− x MnO 3 (Ln = Pr, Nd and Sm) for x = 0.1–0.6 were measured by using differential scanning calorimeter (DSC) and AC calorimeter (ACC). The thermal anomalies accompanied by magnetic transition from ferromagnetism to paramagnetism were observed within x = 0.3–0.6 and the transition temperatures, enthalpy and entropy changes were obtained. The magnetic contribution of heat capacity was estimated from a double exchange model. The estimated value was in a good agreement with the measured heat capacity.