Doping and Oxidation Effects in Raman Spectra of Manganites

Published

April 10, 1999

Author(s)

V B. Podobedov, A Weber, G U. Dezanneau, S U. Pignard, J U. Kreizel, H U. Vincent

Abstract

Raman scattering from La_yR_xMnO_{3-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 A}dg^ mode from 240 to 125 cm^-1 was observed in Sr-doped compounds. While the intensity of disorder-induced Raman bands was found to be sensitive to the oxygen content, the symmetry allowed related Raman modes to exhibit changes in frequency. As an indication of deposition conditions, lowering of the 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.

Proceedings Title

Proceedings of MRS Symposium Proceedings

Conference Dates

April 4-10, 1999

Conference Title

Proceedings of the MRS Symposium

Pub Type

Conferences

Keywords

film, manganite, Raman scattering, structure

Citation

Podobedov, V. , Weber, A. , Dezanneau, G. , Pignard, S. , Kreizel, J. and Vincent, H. (1999), Doping and Oxidation Effects in Raman Spectra of Manganites, Proceedings of MRS Symposium Proceedings (Accessed October 11, 2025)