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Influence of Particle Size on Electrical Transport Properties of La0.67Sr0.33MnO3 Manganite System

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A systematic investigation of lanthanum-based manganite, La0.67Sr0.33MnO3, has been undertaken with a view to understand the influence of varying particle sizes on electrical transport properties. With a viewto obtain materials with varying particle size, they were prepared by sol–gel route, sintering at four different temperatures. The samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The XRD data has been analyzed by Rietveld refinement technique and it has been confirmed that the materials have rhombohedral crystal structure with R3c space group. Metal-insulator transition temperatures (T P) were found to decrease continuously with decreasing particle size where as ferro to paramagnetic transition temperatures (T C) are found to remain constant. The magnetoresistance (MR) values are found to increase with decreasing particle size. With a viewto understand the conduction mechanism, the electrical resistivity data have been analyzed both in the ferromagnetic metallic (T < T P) as well as high temperature paramagnetic insulating (T > T P) regions.
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Keywords: MAGNON; NANOPARTICLE; POLARON; RESISTIVITY; SOL-GEL PROCESS

Document Type: Research Article

Publication date: 2007-06-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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