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The nature of the charge-ordered state in Y0.5Ca0.5MnO3 with a very small average radius of the A-site cations

Arulraj, A and Gundakaram, R and Biswas, A and Gayathri, N and Raychaudhuri, AK and Rao, CNR (1998) The nature of the charge-ordered state in Y0.5Ca0.5MnO3 with a very small average radius of the A-site cations. In: Journal of Physics: Condensed Matter, 10 (20). pp. 4447-4456.

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Abstract

A detailed investigation of Y0.5Ca0.5MnO3 with a very small radius of the A-site cations ([r(A)] approximate to 1.13 Angstrom reveals the occurrence of a charge-ordering transition in the paramagnetic state, at a relatively high temperature of 260 K. The orthorhombic lattice distortion, as measured by the dimensionless index D, is large (similar to 1.75%) over the entire 300-100 K range, but the antiferromagnetic interactions become prominent only at low temperatures (< 160 K). The charge-ordering gap in Y0.5Ca0.5MnO3, measured by low-temperature vacuum tunnelling spectroscopy, is large (similar to 0.5 eV) and the charge-ordered state is unaffected by the application of a magnetic field of 6 T. The study indicates that the nature of charge-ordering in Y0.5Ca0.5MnO3 which is dominated by the cooperative Jahn-Teller effect and the associated lattice distortion is distinctly different from analogous manganates with larger [r(A)].

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Institute of Physics.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 01 Dec 2009 11:30
Last Modified: 01 Dec 2009 11:30
URI: http://eprints.iisc.ernet.in/id/eprint/19411

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