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An electron paramagnetic resonance study of electron–hole asymmetry in charge ordered $Pr_{1-x}Ca_xMnO_3$ (x = 0.64, 0.36)

Joshi, Janhavi P and Sarathy, Vijaya K and Sood, AK and Bhat, SV and Rao, CNR (2004) An electron paramagnetic resonance study of electron–hole asymmetry in charge ordered $Pr_{1-x}Ca_xMnO_3$ (x = 0.64, 0.36). In: Journal of Physics: Condensed Matter, 16 (16). pp. 2869-2878.

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We present and compare the results of temperature-dependent electron paramagnetic resonance (EPR) studies on $Pr_{1-x}Ca_xMnO_3$ 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 showsignificant differences between the two manganites. At room temperature the ‘g’ parameter for the electrondoped 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 $T_{co}$ in the temperature dependence of the asymmetry parameter, \alpha, 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: Journal Article
Publication: Journal of Physics: Condensed Matter
Publisher: Institute of Physics
Additional Information: The copyright belongs to Institute of Physics.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 06 May 2006
Last Modified: 19 Sep 2010 04:26
URI: http://eprints.iisc.ac.in/id/eprint/6568

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