Abstract
We have synthesized La0.67Ca0.33MnO3 (LCMO):xZnO () composites through a citrate gel route and have characterized them for magnetic andmagnetotransport properties. In lower concentrations (), ZnO mostly goes into the perovskite lattice substituting Mn in LCMOand segregates less in the grain boundary region, but at higher concentration(x>0.13) it segregates mostly at the grain boundaries of LCMO and influences the transport propertiessignificantly. A model is proposed which describes the overall resistivity of the system as aparallel combination of a low resistive intragrain conducting path and a high resistiveintergrain insulating path. Using this approach, the grain and grain boundary contributionsto the overall resistivity are separated for all the composites. The field dependent resistivityshows that all the composites have higher values of MR at the transition temperatures(TMI) compared to thatin pure LCMO (x = 0). The highest value of MR is obtained forx = 0.10 and is 76.6% at80 kOe field near TMI.
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