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Title: Giant Magnetoresistance In Bulk Samples Of Lamno3 With Varying Mn4+ Content
Authors: Mahendiran, R
Mahesh, R
Raychaudhuri, A K
Rao, C N R
Keywords: Metal-Nonmetal Transition
Perovskite Oxides
Mixed Valency
Giant Magnetoresistance
Issue Date: Apr-1995
Publisher: Indian Academy of Sciences
Citation: Pramana-Journal Of Physics 44(4), L393-L396 (1995)
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+).
Description: Note. Restricted Access.
Other Identifiers: 0304-4289
Appears in Collections:Research Papers (Prof. C.N.R. Rao)

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