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Structural Distortions in the Paramagnetic Insulating Phase of La0.7Ca0.3MnO3

Published online by Cambridge University Press:  21 March 2011

C.S. Nelson ,
Y.J. Kim ,
J.P. Hill ,
Doon Gibbs ,
V. Kiryukhin ,
T.Y. Koo  and
S-W. Cheong
C.S. Nelson
Affiliation:
Department of Physics, Brookhaven National Laboratory, Upton, NY 11973-5000
Y.J. Kim
Affiliation:
Department of Physics, Brookhaven National Laboratory, Upton, NY 11973-5000
J.P. Hill
Affiliation:
Department of Physics, Brookhaven National Laboratory, Upton, NY 11973-5000
Doon Gibbs
Affiliation:
Department of Physics, Brookhaven National Laboratory, Upton, NY 11973-5000
V. Kiryukhin
Affiliation:
Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854
T.Y. Koo
Affiliation:
Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854 Bell Laboratories, Lucent Technologies, Murray Hill, NJ 07974
S-W. Cheong
Affiliation:
Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854 Bell Laboratories, Lucent Technologies, Murray Hill, NJ 07974
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Abstract

We report x-ray scattering studies of polarons and tilt ordering in the high-temperature, paramagnetic insulating phase of La0.7Ca0.3MnO3. The temperature dependence of scattering due to individual and correlated polarons was measured, and the latter was found to disappear at ∼400 K. The scattering due to tilt ordering, which was observed by tuning the incident photon energy near the La L1 edge, was also measured as a function of temperature. The destruction of tilt ordering at ∼690 K is believed to be associated with the orthorhombic-rhombohedral structural transition.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 678: Symposia EE – Applications of Synchrotron Radiation Techniques…IV , 2001 , EE7.3.1
Copyright
Copyright © Materials Research Society 2001

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