# Magnetoresistance studies on barium doped nanocrystalline manganite

Nagabhushana, BM and Chakradhar, Sreekanth RP and Ramesh, KP and Prasad, V and Shivakumara, C and Chandrappa, GT (2008) Magnetoresistance studies on barium doped nanocrystalline manganite. In: Journal of Alloys and Compounds, 450 (2). pp. 364-368.

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## Abstract

An energetically attractive, simple, fast and a novel low temperature $(300 ^0 C)$ solution combustion route for the synthesis of crystalline and homogeneous nanoparticles of lanthanum barium manganese oxide $La_{0.9}Ba_{0.1}MnO_{3+\delta}$ (LBMO) is reported. Formation and homogeneity of the solid solutions have been confirmed by powder X-ray diffraction (PXRD) and energy dispersive X-ray analysis (EDS) respectively. The Rietveld analysis shows both as-formed as well as calcined samples are in cubic phase with space group pm3m. The microstructure and agglomerated particle size of the compounds are examined by scanning electron microscope. Infrared spectroscopy revealed that both $Mn-O-Mn$ bending mode and $Mn-O$ stretching mode are influenced by calcination temperature. The magnetoresistance measurement on sintered LBMO pellet exhibits a broad metal–insulator transition $(T_{M-I})$ at around 228 K. At 1 T applied magnetic field, LBMO shows magnetoresistance (MR) of 10%, whereas for 4 and 7 T, the negative magnetoresistance values are in the range 51 and 59% respectively at $T_{M-I}$. The experimental resistivity data of the present investigation are fitted to a simple empirical equation in order to understand conduction mechanism in this compound.

Item Type: Journal Article Copyright of this article belongs to Elsevier Magnetically ordered materials;Chemical synthesis;Magnetoresistance;X-ray diffraction Division of Physical & Mathematical Sciences > Physics 27 Mar 2008 19 Sep 2010 04:43 http://eprints.iisc.ernet.in/id/eprint/13517