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Effect of Substitution of $Cr^{3+}$ in Place of $Mn^{3+}$ in Rare-Earth Manganates on the Magnetism and Magnetoresistance: Role of Superexchange Interaction and Lattice Distortion in $LnMn_{1-x}Cr_xO_3$

Gundakaram, R and Arulraj, Anthony and Vanitha, PV and Rao, CNR and Gayathri, N and Raychaudhuri, AK and Cheetham, AK (1996) Effect of Substitution of $Cr^{3+}$ in Place of $Mn^{3+}$ in Rare-Earth Manganates on the Magnetism and Magnetoresistance: Role of Superexchange Interaction and Lattice Distortion in $LnMn_{1-x}Cr_xO_3$. In: Journal of Solid State Chemistry, 127 (2). pp. 354-358.

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Abstract

Magnetic and electrical properties of oxides of the formula $LnMn_{1-x}Cr_xO_3$ (Ln= rare earth) have been investigated to understand the importance of the $Mn^{3+}-O-Cr^{3+}$ superexchange interactions, in contrast to the $Ln_{1-x}A_xMnO_3$ (A= divalent cation) system, where double exchange interactions predominate. All the $LnMn_{1-x}Cr_xO_3$ compositions are ferromagnetic insulators and exhibit small values of negative magnetoresistance (MR) at ordinary temperatures, the highest value of MR at 6 T being \sim 20% at 120 K for some of the compositions. The results underscore the important role of double exchange, as well as lattice distortion effects, in giving rise to high values of MR in $Ln_{1-x}A_xMnO_3$.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 18 Aug 2008
Last Modified: 19 Sep 2010 04:33
URI: http://eprints.iisc.ernet.in/id/eprint/9289

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