Abstract
AbstractTwo kinds of composites with the nominal composition of (1 – x)La0.67Ca0.33MnO3 (LCMO)/x MgO and (1 – x)LCMO/ x SrO were investigated. Different electrical and magnetic transport properties were observed between the two kinds of composites. For the LCMO/MgO composites, the insulator–metal transition temperature (Tp) decreases rapidly with the increase of MgO content and a remarkably enhanced magnetoresistance (MR) peak is observed near Tp. However, for the LCMO/SrO composites, the SrO content has little effect on Tp and the low‐field MR is enhanced over almost the whole temperature range. Moreover, a two‐step magnetization behavior was observed in the LCMO/MgO composites. By calculating in terms of a ferromagnetic grain coupling model, we attribute this difference to the different effects of the secondary phases on the ferromagnetic coupling between the neighboring LCMO grains, which results from the formation of the different interfacial phases at the grain boundary in the two kinds of composites. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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