Comparative study on multifunctional behaviour of rare earth manganites with micro and nano grain size (original) (raw)

Journal of Materials Science: Materials in Electronics, 2014

Abstract

ABSTRACT We have investigated electrical and magnetotransport properties of La0.7Sr0.3MnO3 samples with grain size in micro to nanometric regime. The structural parameters obtained by Rietveld refinement of X-ray diffraction data revealed perovskite structure with orthorhombic (Pnma) and rhombohedral (R3C) symmetry for nano and bulk samples respectively. The average particle size was 22 nm and 2 mu m for the two representative samples. A metal-insulator transition and substantial increase in electrical resistivity was observed in nanomaterials. An enhanced magnetoresistance observed in nanomaterials samples, makes them more promising for advanced device applications. The magnetization study showed signature of ferromagnetic cluster behavior and higher temperature coefficient of magnetization in nanoparticle samples.

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