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Resistivity, Giant Magnetoresistance and Thermopower in $La_{0.7}Sr_{0.3}MnO_3$ Showing a Large Difference in Temperatures Corresponding to the Ferromagnetic Transition and the Insulator - Metal Transition

Mahendiran, R and Mahesh, R and Raychaudhuri, AK and Rao, CNR (1996) Resistivity, Giant Magnetoresistance and Thermopower in $La_{0.7}Sr_{0.3}MnO_3$ Showing a Large Difference in Temperatures Corresponding to the Ferromagnetic Transition and the Insulator - Metal Transition. In: Solid State Communications, 99 (3). pp. 149-152.

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Abstract

$La_{0.7}Sr_{0.3}Mn0_3$ samples prepared by heating the precursor gel at different temperatures in the 873 - 1473 K range show nearly the same ferromagnetic transition temperature $(T_c\approx 392\pm 4K)$, but the insulator- metal like transition temperatures $(T_p)$ are significantly lower $(\approx 170 K)$ than the corresponding $T_cs$ in the samples annealed at lower temperatures (873 K and 1073 K). Magnetoresistance shows a peak only in the sample where $Tp\approx T_c$. Thermopower (S) is large and negative for the samples annealed at lower temperatures, but it is low, exhibiting a change of sign with temperature for the sample annealed at 1473 K.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier.
Keywords: Giant magnetoresistance;Perovskite oxides
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 15 Dec 2006
Last Modified: 19 Sep 2010 04:33
URI: http://eprints.iisc.ernet.in/id/eprint/9155

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