Raman scattering in charge-ordered Pr0.63Ca0.37MnO3: Anomalous temperature dependence of linewidth

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 depende...

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Bibliographic Details
Published in:Europhysics letters 2002-06, Vol.58 (5), p.778-784
Main Authors: Gupta, R, Pai, G. Venketeswara, Sood, A. K, Ramakrishnan, T. V, Rao, C. N. R
Format: Article
Language:English
Subjects:
72.10.Di
75.30.Vn
78.30.-j
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Infrared and raman spectra and scattering
Lattice dynamics
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Other nonmetallic inorganics
Phonon states and bands, normal modes, and phonon dispersion
Phonons and vibrations in crystal lattices
Physics
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Summary: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 $t_{2g}$ spins and Ag phonons.
ISSN:0295-5075
1286-4854
DOI:10.1209/epl/i2002-00417-3