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Charge ordering in electron-doped manganates

Santhosh, PN and Arulraj, Anthony and Vanitha, PV and Singh, RS and Sooryanarayana, K and Rao, CNR (1999) Charge ordering in electron-doped manganates. In: Journal Of Physics:Condensed Matter, 11 (5). L27-L33.

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Electron-doped rare-earth manganates of the type Ca(1-x)Ln(x) MnO3 (Ln = La, Nd, Gd or Y) with x = 0.2 and 0.3 show charge ordering in the 150-270 K range, but the charge-ordering transition temperature, T-CO generally decreases with the decrease in the size of the A-site cations, a trend exactly opposite to that for hole-doped manganates. On the other hand, T-CO increases with x or the electron concentration. These trends are also seen for Ca1-xBixMnO3 compounds (T-CO = 300 K for x = 0.3) which show transitions to a more distorted orthorhombic structure below T-CO. In Ca(1-x)Ln(x) MnO3, Cr doping does not melt the charge-ordered state, unlike the case for the hole-doped systems. CaMnO2.82, for which electron doping is affected by anion vacancies, appears to show charge ordering at around 200 K.

Item Type: Journal Article
Publication: Journal Of Physics:Condensed Matter
Publisher: IOP Publishing
Additional Information: Copyright of this article belongs to Institute of Physics.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 02 Mar 2009 05:54
Last Modified: 19 Sep 2010 05:00
URI: http://eprints.iisc.ac.in/id/eprint/18091

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