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Raman Investigation of the Layered Manganese Perovskite La1.2Sr1.8Mn2O7

Published online by Cambridge University Press:  10 February 2011

D. B. Romero ,
V. B. Podobedov ,
A. Weber ,
J. P. Rice ,
J. F. Mitchell ,
R. P. Sharma  and
H. D. Drew
D. B. Romero
Affiliation:
Optical Technology Division, NIST, Gaithersburg, MD 20899, USA Department of Physics, University of Maryland, College Park, MD 20742, USA
V. B. Podobedov
Affiliation:
Optical Technology Division, NIST, Gaithersburg, MD 20899, USA Institute of Spectroscopy, Russian Academy of Science, Troitsk, Moscow 142092, Russsia
A. Weber
Affiliation:
Optical Technology Division, NIST, Gaithersburg, MD 20899, USA
J. P. Rice
Affiliation:
Optical Technology Division, NIST, Gaithersburg, MD 20899, USA
J. F. Mitchell
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, USA
R. P. Sharma
Affiliation:
Department of Physics, University of Maryland, College Park, MD 20742, USA
H. D. Drew
Affiliation:
Department of Physics, University of Maryland, College Park, MD 20742, USA
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Abstract

We report the results of a detailed polarization and temperature dependence study of the Raman scattering from La1.2Sr1.8Mn2O7. The Raman spectra reveal three general spectral features. First, there are sharp peaks due to long-wavelength optic phonons. Phonons, attributed to the distortion of the MnO6 octahedra, reveal an anomalous behavior which correlates with the transition from a paramagnetic-insulating (PI) to a ferromagnetic-metallic (FM) phase at a critical temperature Tc. Second, there is an electronic continuum that is suppressed for ω < 500 cm−1 at T ≪ Tc. Third, broad peaks between 400 cm1 to 800 cm−1 seen in the PI state, surprisingly, disappear in the FM state. The implications of these results are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 494: Symposium V – Science & Technology of Magnetic Oxides , 1997 , 305
Copyright
Copyright © Materials Research Society 1998

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References

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