Abstract
We have studied the magneto-transport properties of the (1−x) La0.67Ca0.33MnO3/xCo3O4 (x∼0, 0.05, 0.10, 0.15 and 0.20) combined samples, prepared via sol–gel process. The powder X-ray diffraction patterns indicate no evidence of reaction between the La0.67Ca0.33MnO3 and Co3O4. A clear metal to insulator (M–I) transition is observed at 260K in virgin LCMO sample while that vanishes in the LCMO/Co3O4 combined samples in the measured temperature range (80–300K). Resistivity of the combined samples increases sharply as a consequence of Co3O4 addition, especially on the low temperatures, and magnetization decreases. An enhancement in low field magnetoresistance (LFMR) is observed at temperatures below 125K for the composites with lower Co3O4 content, namely, x=0.05 and 0.10. It is argued that this improved LFMR at low temperature (T<125K) arises due to the enhanced spin-polarized tunneling at the grain boundaries in the combined samples.
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