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A Raman spectroscopy study of disorder and local vibrational modes in La0.7Sr0.3Mn1-xMxO3 (M=Fe, co)

Title
A Raman spectroscopy study of disorder and local vibrational modes in La0.7Sr0.3Mn1-xMxO3 (M=Fe, co)
Authors
Nguyen Van MinhKim, Sung-JinYang, In-Sang
Ewha Authors
김성진양인상
SCOPUS Author ID
김성진scopus; 양인상scopus
Issue Date
2008
Journal Title
JOURNAL OF THE KOREAN PHYSICAL SOCIETY
ISSN
0374-4884JCR Link
Citation
vol. 52, no. 5, pp. 1402 - 1405
Keywords
manganitesdisorderRaman spectroscopy
Publisher
KOREAN PHYSICAL SOC
Indexed
SCI; SCIE; SCOPUS; KCI WOS scopus
Abstract
We present results of Raman scattering and X-ray diffraction studies of La0.7Sr0.3Mn1-xMxO3 manganites. Some Mn atoms were replaced by Fe and Co with x in the range of 0.0 - 0.75. XRD analysis of these samples indicates a change in the cell parameters with doping content. Our main focus is the Raman peak at high frequency (>630 cm(-1)), which is somewhat controversial. The Raman spectra exhibit an additional high-frequency mode attributed to a local breathing vibration of the oxygen surrounding the substituent ion. The frequency and the intensity of the Raman spectra in these manganites axe very sensitive to the type and the amount of the substituent. From the above results, a critical substituent content at which the structural phase changed is shown.
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자연과학대학 > 화학·나노과학전공 > Journal papers
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