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- Title
Raman study of orbital mediated multiphonons in RMnO<sub>3</sub> (R = Pr,Sm,Eu,Tb,Y).
- Authors
Laverdière, J.; Jandl, S.; Mukhin, A. A.; Ivanov, V. Yu.
- Abstract
We have studied RMnO3 manganites (R = Pr, Sm, Eu, Tb, Y) Raman excitations in the 200–2800 cm-1 range as a function of temperature. Combinations of phonon energies are observed up to the fourth order, indicating the presence of electron-phonon coupling. In comparison to Γ-point phonon combinations, double phonon excitations appear to be blue shifted in large size rare earth ion compounds. The phonon combination intensities decrease rapidly with their increasing order, confirming other studies which conclude that the electron-phonon coupling is not as strong as supposed in the localized limit. Moreover, different intensity order dependences are observed between the phonon combination and the so-called Jahn-Teller mode. These effects are better described in the orbiton-phonon coupling scheme.
- Subjects
MANGANITE; RAMAN spectroscopy; ELECTRON-phonon interactions; JAHN-Teller effect; COUPLED mode theory (Wave-motion); POLARONS
- Publication
European Physical Journal B: Condensed Matter, 2006, Vol 54, Issue 1, p67
- ISSN
1434-6028
- Publication type
Article
- DOI
10.1140/epjb/e2006-00419-y