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Effect of Internal Pressure on Charge-Ordered Rare Earth Manganates

Rao, CNR and Santhosh, PN and Singh, RS and Arulraj, A (1998) Effect of Internal Pressure on Charge-Ordered Rare Earth Manganates. In: Journal of Solid State Chemistry, 135 (1). pp. 169-173.

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Abstract

The effect of internal pressure on charge-ordered rare earth manganates of the composition $Ln_{1-x}A_xMnO_3$ (Ln=La, Pr, Nd and A=Ca, Sr) has been studied by varying the average radius of the A site cations $(\langle r_A\rangle)$. increasing $\langle r_A\rangle$ is generally accompanied by an increase in the ferromagnetic transition temperature and a decrease in the charge- ordering transition temperature. On increasing the size of the A site cations by appropriate substitution, charge- ordered insulators such as $Pr_{0.7}Ca_{0.3}MnO_3$ and $Nd_{0.5}Ca_{0.5}MnO_3$ become ferromagnetic, accompanied by an insulator-metal transition. In $Pr_{0.5}Sr_{0.5}MnO_3$, substitution of La in place of Pr destroys the antiferromagnetic transition and favors the ferromagnetic metallic state.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 27 Dec 2006
Last Modified: 19 Sep 2010 04:33
URI: http://eprints.iisc.ernet.in/id/eprint/9202

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