Abstract
With Nd3+ ionic doping, series of perovskite manganites La0.7−x Nd x Ba0.3MnO3 (x=0, 0.05, 0.1) were prepared by the sol-gel technique. The magnetocaloric correlative measurement of La0.65Nd0.05Ba0.3MnO3 was representatively carried out. Double metal–insulator peaks being found on the resistivity–temperature curves of samples, the maximum of magnetic entropy change was found to be ΔS H=−1.3 J/kg K and its refrigerant capacity 52 J/kg, obtained in the vicinity of room temperature under the variation of 1 T magnetic field. The comparative faint Nd3+ magnetic inhomogeneity submerged in the double-exchange strong magnetic signal along with the differential coefficient of the magnetic moment with temperature, in the physical definition of the magnetic entropy change, resulting in a single peak on the magnetic entropy change curve.
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