Please use this identifier to cite or link to this item: http://lib.jncasr.ac.in:8080/jspui/handle/10572/912
Title: The Nature of Charge Ordering in Rare Earth Manganates and Its Strong Dependence on the Size of the A-Site Cations
Authors: Kumar, N
Rao, C N R
Keywords: rare earth manganates
A-site cations
regime
antiferro-magnetic state
paramagnetic state
Issue Date: Mar-1997
Publisher: Academic Press Inc
Citation: Journal Of Solid State Chemistry 129(2), 363-366 (1997)
Abstract: Charge ordering in rare earth manganates of the typeLn0.5A0.5MnO3(Ln=rare earth,A=alkaline earth) is highly sensitive to the average radius of the A-site cations, 〈rA〉. In the small 〈rA〉 regime (e.g., Y0.5Ca0.5MnO3), charge ordering occurs in the paramagnetic state, the transformation to an antiferro-magnetic state occurring at still lower temperatures. At moderate 〈rA〉 values (e.g., Nd0.5Sr0.5MnO3), a ferromagnetic metallic state transforms to a charge-ordered antiferromagnetic state with cooling. These two distinct types of charge ordering and associated properties are explained in terms of the variation of the exchange couplings JFM and JAFM with 〈rA〉 and the invariance of the single-ion Jahn–Teller energy with 〈rA〉. A qualitative temperature–〈rA〉 phase diagram, consistent with the experimental observations, has been constructed to describe the properties of the manganates in the different 〈rA〉 regimes.
Description: Letter. Restricted Access.
URI: http://hdl.handle.net/10572/912
Other Identifiers: 0022-4596
Appears in Collections:Research Papers (Prof. C.N.R. Rao)

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