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Giant magnetoresistance in bulk samples of LaMnO3 with varying Mn4+ content

Mahendiran, R and Mahesh, R and Raychaudhuri, AK and Rao, CNR (1995) Giant magnetoresistance in bulk samples of LaMnO3 with varying Mn4+ content. In: Pramana - Journal of Physics, 44 (4). L393-L396.

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Abstract

Magnetoresistance (MR) in bulk samples of LaMnO3 has been investigated by varying the Mn4+ content from 10 to 33 per cent by chemical means, without aliovalent doping. With the increase in Mn4+ content, the structure of LaMnO3 changes first from orthorhombic to rhombohedral and then to cubic and the material becomes increasingly ferromagnetic, exhibiting a resistivity maximum akin to an insulator-metal transition at T-Peak, just below the ferromagnetic T-c. The magnitude of MR is highest in the cubic sample (with 33% Mn4+) around the T-Peak, and negligible in the non-magnetic orthorhombic sample (12% Mn4+).

Item Type: Editorials/Short Communications
Additional Information: Copyright of this article belongs to Indian Academy of Sciences.
Keywords: Metal-nonmetal transition;perovskite oxides;mixed valency; giant magnetoresistance
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 31 May 2011 08:34
Last Modified: 31 May 2011 08:34
URI: http://eprints.iisc.ernet.in/id/eprint/38015

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