Arulraj, Anthony ; Gundakaram, R. ; Biswas, Amlan ; Gayathri, N. ; Raychaudhuri, A. K. ; Rao, C. N. R. (1998) The nature of the charge-ordered state in Y0.5Ca0.5MnO3 with a very small average radius of the A-site cations Journal of Physics: Condensed Matter, 10 (20). pp. 4447-4456. ISSN 0953-8984
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Official URL: http://iopscience.iop.org/0953-8984/10/20/012
Related URL: http://dx.doi.org/10.1088/0953-8984/10/20/012
A detailed investigation of Y0.5Ca0.5MnO3 with a very small radius of the A-site cations (rA)≈1.13 Å 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 (∼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 (∼0.5eV) 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 (rA).
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|Deposited On:||04 Jun 2011 19:16|
|Last Modified:||05 Jul 2012 09:32|
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