Magnetocaloric effect in La0.7−xPrxSr0.3MnO3 manganites: Direct and indirect measurements

•The specific heat in La0.7−xPrxSr0.3MnO3 manganites were investigated.•Direct and indirect measurements magnetocaloric effect for La0.7−xPrxSr0.3MnO3.•The maximum value of the MCE is observed for a sample with x = 0.7 ΔS = −421 J/kg K for H = 18 kOe.•In a wide range of changes in the concentration of Pr, the value of the MCE varies little. The results of investigation of specific heat, and magnetocaloric effect for La0.7−xPrxSr0.3MnO3 (x = 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7) manganites in the temperature range of 100–425 K at H = 0 and 18 kOe are presented. The magnetocaloric properties have been investigated by direct and indirect measurement techniques. The value of ΔT ranges from 1.09 K to 1.75 K and ΔS from 1.84 J/kg K to 4.21 J/kg K in a magnetic field of 18 kOe. In a wide range of changes in the concentration of Pr, the value of the MCE varies little, and with increasing Pr concentration, TC decreases.