ELECTRICAL TRANSPORT PROPERTIES AND MAGNETORESISTANCE OF(La0.7Ca0.3MnO3)1-x/(CuFe2O4)xCOMPOSITES

Young Joo Kim, Shalendra Kumar, Yong Jun Seo, Jiho Chang, Chan Gyu Lee and Bon Heun Koo ()
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Young Joo Kim: School of Nano and Advanced Materials Engineering, Changwon National University, Changwon, Korea
Shalendra Kumar: School of Nano and Advanced Materials Engineering, Changwon National University, Changwon, Korea
Yong Jun Seo: School of Nano and Advanced Materials Engineering, Changwon National University, Changwon, Korea
Jiho Chang: Major of Semiconductor Physics, Korea Maritime University, Busan, Korea
Chan Gyu Lee: School of Nano and Advanced Materials Engineering, Changwon National University, Changwon, Korea
Bon Heun Koo: School of Nano and Advanced Materials Engineering, Changwon National University, Changwon, Korea

Surface Review and Letters (SRL), 2010, vol. 17, issue 01, 33-38

Abstract: The(La0.7Ca0.3MnO3)1-x/(CuFe2O4)x(x = 0–0.15)composites were prepared by conventional solid state reaction method. We have investigated the structural, magnetic and electrical properties of(La0.7Ca0.3MnO3)1-x/(CuFe2O4)xcomposites using X-ray diffraction (XRD), scanning electron microscopy, field cooled DC magnetization and magnetoresistance (MR) measurements. The resistance measured as a function of temperature demonstrates that pure LCMO samples display metal to semiconductor transition. On the other hand, all the LCMO/CFO composites samples clearly present the electrical behavior of insulator/semiconductor. It indicates that resistivity of the samples increase systemically with the increase of CFO content. The MR was measured in the presence of 0.5 T field. At low temperatures, it is clearly observed that the MR effect is enhanced withx = 0.03of CFO composition. In summary, the spin-polarized tunneling and the spin-dependent scattering may be helpful to the improved low-field magnetoresistance (LFMR) effect. These phenomena can be explained by the segregation of a new phase related to CFO at the grain boundaries or surfaces of the LCMO grains.

Keywords: (La0.7Ca0.3MnO3)1-x/(CuFe2O4)xcomposites; low field magnetoresistance (LFMR); secondary grain boundary; Curie temperature (Tc); spin-polarized tunneling; spin-dependent scattering (search for similar items in EconPapers)
Date: 2010
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DOI: 10.1142/S0218625X10013667

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