Abstract
We report the magnetocaloric and magneto-transport properties of the perovskites manganites composites (La0.6Ca0.4MnO3)/x(CuO) (LCMO/CuO) (x = 0.00, 0.07 and 0.18) synthesized by solid-state reaction method. X-ray diffraction (XRD) study was employed to confirm the formation of both the phases in composites. The results of magnetic measurements indicate that CuO mainly segregates at the grain boundaries of LCMO. Arrott analysis and master curve behavior reveal second order of magnetic phase transition in the composite samples. Magnetic entropy change increases with increasing CuO content and a maximum of 3 J/kg.K at 2 T has been observed in LCMO/(0.18)CuO sample. The detailed electrical characterizations showed that with increasing the CuO doping level, Tρ shifts to a lower temperature and the resistivity decreases. The low field magnetoresistance (LFMR) results from spin-polarized tunneling. However, around room temperature, the enhanced MR of the composites is caused by magnetic disorder. MR has been found to reach a maximum value of 30% at 2 T applied field with 18% CuO addition. The enhanced MR and ΔSM of these composites make them attractive for potential applications.
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