Kumar, Jitendra and Singh, Rajiv K. and Singh, H. K. and Siwach, P. K. and Singh, Ramadhar and Srivastava, O. N. (2008) Magnetotransport in La0.7Ca0.3MnO3–PMMA composites synthesized by polymeric precursor route. Journal of Alloys and Compounds, 455 (1-2). pp. 289-294. ISSN 0925-8388

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Abstract

A detailed investigation on the effect of PMMA on the structure, microstructure and magnetotransport properties of manganite La0.7Ca0.3MnO3 (LCMO) is presented. LCMO–PMMA nano-composites have been synthesized by a unique polymeric sol–gel route, which leads to improved solubility of PMMA in the LCMO matrix. The LCMO phase is grown in the presence of varying PMMA concentration at ∼500 °C. This route yields single-phase material at significant lower temperature (∼500 °C) and the grain size is observed to decrease slightly with increasing PMMA concentration. On increasing the PMMA concentration, TC undergoes a small decrease, resistivity is observed to increase by two orders of magnitude, with a concomitant large decrease in TIM, e.g., from ∼218 K for virgin LCMO to ∼108 K for ∼50 wt% PMMA admixed LCMO. Low field magnetoresistance measured in the temperature range 77–300 K shows considerable enhancement as a function of the PMMA concentration. These phenomena are explained by taking into account the increased intergranular disorder as a consequence of PMMA admixture.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier B.V.
Subjects:	Chemistry Materials Science Metallurgy & Metallurgical Engineering
Divisions:	UNSPECIFIED
Depositing User:	Ms Neetu Chandra
Date Deposited:	15 Apr 2015 11:23
Last Modified:	15 Apr 2015 11:23
URI:	http://npl.csircentral.net/id/eprint/1091

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