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Coupling of Lattice Dynamics to Spin Transitions in La1-xSrxCoO3

Published online by Cambridge University Press:  01 February 2011

Despina Louca  and
J. L. Sarrao
Despina Louca
Affiliation:
University of Virginia, Dept. of Physics, Charlottesville, VA 22903.
J. L. Sarrao
Affiliation:
Los Alamos National Laboratory, MST-10, Los Alamos, NM 87545.
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Abstract

La1-xSrxCoO3 is distinct because of its unique spin transitions subjecting the system to variable spin-lattice coupling. Pair density function analysis provided strong evidence for local lattice distortions associated with a Jahn-Teller active mode that is directly correlated to the change in the magnetic/conductive states of this system. The presence of Jahn-Teller distortions also serves as an indication for the intermediate spin configuration. Measurements of the dynamic structure function, S(Q, ω), showed that several phonon peaks fluctuate with carrier density and temperature. Such changes were not seen in an otherwise identical structure, LaAlO3. These phonon peaks are quite unusual and are most likely due to localized modes that appear to be dispersionless.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 718: Symposium D – Perovskite Materials , 2002 , D5.10
Copyright
Copyright © Materials Research Society 2002

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