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Doping and Oxidation Effects in Raman Spectra of Manganites

Published online by Cambridge University Press:  10 February 2011

V. B. Podobedov ,
A. Weber ,
G. Dezanneau ,
S. Pignard ,
J. Kreizel  and
H. Vincent
V. B. Podobedov
Affiliation:
NIST Optical Technology Division, Gaithersburg, MD 20899, USA
A. Weber
Affiliation:
NIST Optical Technology Division, Gaithersburg, MD 20899, USA
G. Dezanneau
Affiliation:
LMGP (UMR CNRS 2856) ENS de Physique de Grenoble, 38402 St Martin d'Heres, France
S. Pignard
Affiliation:
LMGP (UMR CNRS 2856) ENS de Physique de Grenoble, 38402 St Martin d'Heres, France
J. Kreizel
Affiliation:
LMGP (UMR CNRS 2856) ENS de Physique de Grenoble, 38402 St Martin d'Heres, France
H. Vincent
Affiliation:
LMGP (UMR CNRS 2856) ENS de Physique de Grenoble, 38402 St Martin d'Heres, France
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Abstract

Raman scattering from LayRxMnO3-δ compounds (single crystals, ceramics, films) was studied as a function of kind (R) and amount (x) of dopant as well as of oxygen deficit (δ). For x = 0.1 to 0.55, a nearly linear Raman shift of the Ag mode from 240 to 125 cm−1 was observed in Srdoped compounds. While the intensity of disorder-induced Raman bands was found to be sensitive to the oxygen content, the symmetry allowed related Raman modes exhibit the changes in the frequency. As an indication of deposition conditions, lowering of a symmetry of the film structures with respect to single crystals and ceramics was detected. We discuss the physical nature of the observed effects and show how Raman data can be used for the optical characterization of manganite samples.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 574: Symposia BB – Multicomponent Oxide Films for Electronics , 1999 , 143
Copyright
Copyright © Materials Research Society 1999

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References

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