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# Insulator–Metal Transitions, Giant Magnetoresistance, and Related Aspects of the Cation-Deficient $LaMnO_3$ Compositions $La_{1-\delta}MnO_3$ and $LaMn_{1-\delta'}O_3$

Arulraj, Anthony and Mahesh, R and Subbanna, GN and Mahendiran, R and Raychaudhuri, AK and Rao, CNR (1996) Insulator–Metal Transitions, Giant Magnetoresistance, and Related Aspects of the Cation-Deficient $LaMnO_3$ Compositions $La_{1-\delta}MnO_3$ and $LaMn_{1-\delta'}O_3$. In: Journal of Solid State Chemistry, 127 (1). pp. 87-91.

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## Abstract

Electron transport and magnetic properties of the cation- deficient compositions of $LaMnO_3$ with the nominal formulae $La_{1-\delta}MnO_3 (0.0\leq\delta\leq0.2)$ and $LaMn_{1-\delta'}O_3 (0.0\leq\delta'\leq 0.2)$ were investigated after their defect structures were examined. $La_{1-\delta}MnO_3 (\delta=0.1)$ contains more than one defect structure involving both La and Mn vacancies. $La_{1-\delta}MnO_3 (0.0\leq\delta\leq0.2)$ compositions are all ferromagnetic and show insulator–metal (I–M) transition, with the resistivity decreasing with increasing \delta. $LaMn_{1-\delta'}O_3$ compositions show ferromagnetism and the I-M transition only up to {\delta'}=0.05, with the resistivity increasing with {\delta'}. All compositions showing the I-M transitions exhibit giant magnetoresistance.

Item Type: Journal Article Copyright of this article belongs to Elsevier. Division of Chemical Sciences > Solid State & Structural Chemistry UnitDivision of Physical & Mathematical Sciences > Physics 23 Nov 2006 19 Sep 2010 04:32 http://eprints.iisc.ernet.in/id/eprint/9007

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