Volume 58, Number 5, June 2002
|Page(s)||778 - 784|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 May 2002|
Raman scattering in charge-ordered Pr0.63Ca0.37MnO3: Anomalous temperature dependence of linewidth
Department of Physics, Indian Institute of Science -
Bangalore 560012, India
2 Centre for Condensed Matter Theory, Department of Physics Indian Institute of Science - Bangalore 560012, India
3 CSIR Centre for Excellence in Chemistry, Jawaharlal Nehru Centre for Advanced Scientific Research - Jakkur P.O., Bangalore 560064, India
Accepted: 6 March 2002
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 spins and Ag phonons.
PACS: 75.30.Vn – Colossal magnetoresistance / 78.30.-j – Infrared and Raman spectra / 72.10.Di – Scattering of phonons, magnons, and other nonlocalized excitations
© EDP Sciences, 2002
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