Electronic transport in LCMO/BTO composites |
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Authors: | L. Joshi S.K. Rout |
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Affiliation: | Department of Applied Physics , Birla Institute of Technology , Mesra, Ranchi-835215, India |
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Abstract: | A series of (1 ? x)La0.67Ca0.33MnO3/(x)BaTiO3 composites has been synthesized by the solid state route. Microstructural and transport studies on these samples show a complete immiscibility between metallic ferromagnet, La0.67Ca0.33MnO3 (LCMO) and insulating ferroelectric, BaTiO3 (BTO). Temperature dependent electrical transport studies show evidence of both intrinsic and extrinsic colossal magnetoresistance (CMR) effects. Inclusion of BTO in LCMO phase results in high resistive samples with a metal-insulator transition at temperature Tp 1 originating from intrinsic effect and another dominant metal-insulator transition at temperature Tp 2 caused because of extrinsic effect. Tp 2 decreases up to a certain percentage of BTO content above which this trend of variation is reversed. |
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Keywords: | FM–FE composites extrinsic CMR effect interfacial tunneling M-I transition |
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