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X-Ray Absorption Fine Structure Applied to the Study of Systems with Lattice Instabilities

Published online by Cambridge University Press:  15 February 2011

J. MUSTRE DE Leon ,
S. D. Conradson ,
T. Tyson ,
A. R. Bishop ,
M. Salkola ,
F.J. Espinosa  and
J. L. Peña
J. MUSTRE DE Leon
Affiliation:
CINVESTAV-Mérida, Mérida, Yuc., 97133, México
S. D. Conradson
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico
T. Tyson
Affiliation:
New Jersey Institute of Technology, Newark, New Jersey
A. R. Bishop
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico
M. Salkola
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico
F.J. Espinosa
Affiliation:
CINVESTAV-Mérida, Mérida, Yuc., 97133, México
J. L. Peña
Affiliation:
CINVESTAV-Mérida, Mérida, Yuc., 97133, México
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Abstract

We present a simplified model of electrons and phonons in a three-site cluster as a paradigm of a system exhibiting a lattice instability. We point out the utility of X-ray absorption fine structure (XAFS) in the study of materials where the coupling between electrons and phonons leads to the appearance of such lattice instabilities. As examples of these systems, we present X-ray absorption fine structure (XAFS) measurements on magnetic manganese oxide materials and II-VI semiconductors. Both of these systems exhibit local lattice instabilities which are reflected in the transport properties. In the case of the manganese oxide La0.67Ca0.33MnO3 we observe a change in the Mn-O local structure accompanying the ferromagnetic and metal-insulator transitions. For In doped CdTe we observe the appearance of a lattice distortion centered at the Cd atoms as the In concentration is increased. This distortion is associated with the trapping of free charge carriers, leading to the saturation of the conductivity as the In concentration increases.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 437: Symposium DD – Applications of Synchrotron Radiation to III , 1996 , 189
Copyright
Copyright © Materials Research Society 1996

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