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Title: The nature of the charge-ordered state in Y0:5Ca0:5MnO3 with a very small average radius of the A-site cations
Authors: Arulraj, Anthony
Gundakaram, R
Biswas, Amlan
Gayathri, N
Raychaudhuri, A K
Rao, C N R
Keywords: Colossal-Magnetoresistance
Issue Date: 25-May-1998
Publisher: IOP Publishing Ltd
Citation: Journal Of Physics :Condensed Matter 10(20), 4447-4456 (1998)
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)].
Description: Restricted Access
Other Identifiers: 0953-8984
Appears in Collections:Research Papers (Prof. C.N.R. Rao)

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