Magnetic entropy change in perovskite manganites La0.6Pr0.1Pb0.3MnO3 with double metal-insulator peaks

Following the double metal-insulator peaks found in series of perovskite manganites La0.7-xPrxPb0.3MnO3 (x=0, 0.05, 0.1), the magnetic entropy change of La0.6Pr0.1Pb0.3MnO3 was carefully investigated as a representative. The maximum magnetic entropy change (Delta S-H =-1.7 J/kg K at 300 K) and the expanded refrigerant capacity (about 123.8 J/kg) had been obtained under 10 kOe magnetic field variation, though the double peak of maximum magnetic entropy change had not occurred since the comparative faint magnetic signal from the Pr ions inhomogeneity existed in the octahedral frame submerged in the strong magnetic signal originated from the dominating octahedral frame both in the double exchange mechanism, but the width at half maximum in the magnetic entropy change comparatively broadened. (C) 2011 Elsevier B.V. All rights reserved.