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Determination of The Local Atomic Structure of LA2-x(SR,BA)xCUO4 Materials From Neutron Powder Diffraction Data

Published online by Cambridge University Press:  22 February 2011

S. J. L. Billinge  and
G. H. Kwei
S. J. L. Billinge
Affiliation:
Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824.
G. H. Kwei
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94550.
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Abstract

We describe the use of neutron powder diffraction for studying the local structure of high-temperature superconductors. This is accomplished by carrying out a pair distribution function (PDF) analysis. This approach does not presume a periodic structure and allows short range deviations from perfect crystalline order to be observed. Data from a sample of La2CuO4 collected on two different diffractometers are compared to determine the degree of reproducibility of the results. It is found that the data reproduce very well; however, a model-PDF, fit to the data assuming the average crystal structure in the low-temperature-orthorhombic (LTO) phase, differs from the data in a number of significant ways. This is related to earlier observations that the local structure of the La1.875Ba0.125CuO4 compound differs from the average crystal structure.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 376: Symposium BB – Neutron Scattering in Materials Science , 1994 , 523
Copyright
Copyright © Materials Research Society 1995

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References

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