Raman scattering in charge-ordered $Pr_{0.63} Ca_{0.37}MnO_3$: anomalous temperature dependence of linewidth

Gupta, R and Pai, Venketeswara G and Sood, AK and Ramakrishnan, TV and Rao, CNR (2002) Raman scattering in charge-ordered $Pr_{0.63} Ca_{0.37}MnO_3$: anomalous temperature dependence of linewidth. In: Europhysics Letters, 58 (5). pp. 778-784.

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Abstract

We report on the evolution of the Raman-active $A_g$ phonon modes in the charge-ordered manganite $Pr_{0.63} Ca_{0.37}MnO_3$as a function of temperature from 300 K to 25 K. Our studies reveal that the linewidths of the $A_g(2)$ and $A_g(4)$ phonons increase as temperature decreases. This anomalous temperature dependence of phonon lineshapes, seen for the first time in charge-ordered manganites, can be quantitatively understood in terms of a strong spin-phonon coupling involving $t_2_g$ spins and $A_g$ phonons.

Item Type:	Journal Article
Publication:	Europhysics Letters
Publisher:	Europhysics Society by EDP Sciences and Soc. Italiana Fisica
Additional Information:	Copyright of this article belongs to EDP Sciences.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	21 Nov 2007
Last Modified:	19 Sep 2010 04:28
URI:	http://eprints.iisc.ac.in/id/eprint/7368

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