An electron paramagnetic resonance study of electron-hole asymmetry in charge ordered Pr1-xCaxMnO3 (x = 0.64, 0.36)

Joshi, Janhavi P. ; Sarathy, K. Vijaya ; Sood, A. K. ; Bhat, S. V. ; Rao, C. N. R. (2004) An electron paramagnetic resonance study of electron-hole asymmetry in charge ordered Pr1-xCaxMnO3 (x = 0.64, 0.36) Journal of Physics : Condenced Matter, 16 (16). pp. 2869-2878. ISSN 0953-8984

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Official URL: http://iopscience.iop.org/0953-8984/16/16/011?from...

Related URL: http://dx.doi.org/10.1088/0953-8984/16/16/011

Abstract

We present and compare the results of temperature-dependent electron paramagnetic resonance (EPR) studies on Pr1-xCaxMnO3 for x = 0.64, which is electron-doped, with results of studies on the hole-doped, x = 0.36 composition. The temperature dependence of the various parameters obtained from the powder and single crystal spectra show significant differences between the two manganites. At room temperature the 'g' parameter for the electron-doped system is less than the free electron 'g' value 'ge ', whereas for the hole-doped system it is more than 'ge '. Further, the linewidth obtained from the powder spectra as well as the single crystal spectra show different functional dependences on temperature in the two systems. Quite strikingly, the peak observed at Tco in the temperature dependence of the asymmetry parameter, α, of the single crystal spectra in the hole-doped system, is absent in the electron-doped system. We understand this contrasting behaviour of the EPR parameters in the two systems in terms of the very different nature of microscopic interactions in them.

Item Type:Article
Source:Copyright of this article belongs to Institute of Physics Publishing.
ID Code:2893
Deposited On:09 Oct 2010 05:36
Last Modified:16 May 2016 13:48

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