Low field magneto-transport in La_0.7Ca_0.3MnO_3-PMMA composites synthesized by polymeric precursor route

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dc.creatorKumar, Jitendra
dc.creatorSingh, Rajiv K.
dc.creatorSingh, H. K.
dc.creatorSiwach, P. K.
dc.creatorKataria, N. D.
dc.creatorSingh, Ramadhar
dc.creatorSrivastava, O. N.
dc.date2005-04-22
dc.date.accessioned2026-07-07T03:04:52Z
dc.date.available2026-07-07T03:04:52Z
dc.descriptionA detailed investigation of the effect of PMMA on the structure, microstructure and magneto-transport properties of manganite La_0.7Ca_0.3MnO_3 (LCMO) is presented. LCMO-PMMA nanostructured 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 ^0 C. This route yields single phase material and the grain size is observed to decrease slightly with increasing PMMA concentration. On increasing the PMMA concentration, T_C undergoes a small decrease, resistivity is observed to increase by two orders of magnitude, with a concomitant large decrease in T_IM, e.g., from 218 K for virgin LCMO to 108 K for 50 wt% PMMA admixed LCMO. Low field magneto-resistance 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.
dc.description23 pages, 9 figures, submitted to J. Mag. Magn. Materials
dc.identifierhttps://arxiv.org/abs/cond-mat/0504579
dc.identifierhttp://arxiv.org/abs/cond-mat/0504579
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/26252
dc.subjectMaterials Science
dc.titleLow field magneto-transport in La_0.7Ca_0.3MnO_3-PMMA composites synthesized by polymeric precursor route
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