Raman scattering in charge-ordered Pr<sub>0.63</sub>Ca<sub>0.37</sub>MnO<sub>3</sub>: Anomalous temperature dependence of linewidth
EPL (Europhysics Letters) 58(5): 778-784
Article 2002 English
Authors
RG
Rajeev Gupta
GP
G. Venketeswara Pai
AS
A. K. Sood
Abstract
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We report on the evolution of the Raman-active Ag phonon modes in the charge-ordered manganite Pr0.63Ca0.37MnO3 as a function of temperature from 300 K to 25 K. Our studies reveal that the linewidths of the Ag(2) and Ag(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 t2g spins and Ag phonons.
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