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Enhancement of magnetoresistance in $La_{0.67}Ca_{0.33}MnO_3 /Pr_{0.7}Ca_{0.3}MnO_3$ epitaxial multilayers

Venimadhav, A and Hedge, MS and Rawat, R and Das, I and Marssi, M El (2001) Enhancement of magnetoresistance in $La_{0.67}Ca_{0.33}MnO_3 /Pr_{0.7}Ca_{0.3}MnO_3$ epitaxial multilayers. In: Journal of Alloys and Compounds, 326 (1-2). pp. 270-274.

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Abstract

Multilayers of perovskite manganite oxides $La_{0.67}{Ca_0.33}MnO_3 /Pr_{0.7}Ca_{0.3}MnO_3$, $La_{0.67}Ca_{0.33}MnO_3/LaMnO_3$ have been fabricated by pulsed laser deposition. Magnetoresistance (defining R(0)-R(H)/R(0)) of 98% has been observed in multilayers with $Pr_{0.7}Ca_{0.3}MnO_3$ as the spacer layer. No enhancement is observed in multilayers with $LaMnO_3$ as the spacer layer. Enhanced magnetoresistance in $La_{0.67}Ca_{0.33}MnO_3 /Pr_{0.7}Ca_{0.3}MnO_3$ multilayers is explained on the basis of induced double exchange in the $Pr_{0.7}Ca_{0.3}MnO_3$ layer as Mn exists both in 3+ and 4+ states. Such a facility does not exist in $La_{0.67}Ca_{0.33}MnO_3/LaMnO_3$ as Mn is present only in the 3+ state in $LaMnO_3$.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier.
Keywords: Manganite;Spacer layer;Multilayer;Magnetoresistance;Double exchange
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 12 Apr 2007
Last Modified: 19 Sep 2010 04:36
URI: http://eprints.iisc.ernet.in/id/eprint/10431

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