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Structural characterization of La2−xMxCuO4 (M = Sr,Ba) samples by synchrotron x-ray and neutron powder diffraction techniques

Published online by Cambridge University Press:  31 January 2011

D. E. Cox ,
S. C. Moss ,
R. L. Meng ,
P. H. Hor  and
C. W. Chu
D. E. Cox
Affiliation:
Department of Physics, Brookhaven National Laboratory, Upton, New York 11973
S. C. Moss
Affiliation:
Department of Physics, University of Houston, Houston, Texas 77004
R. L. Meng
Affiliation:
Department of Physics and Texas Center for Superconductivity, University of Houston, Houston, Texas 77004
P. H. Hor
Affiliation:
Department of Physics and Texas Center for Superconductivity, University of Houston, Houston, Texas 77004
C. W. Chu
Affiliation:
Department of Physics and Texas Center for Superconductivity, University of Houston, Houston, Texas 77004
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Abstract

High-resolution synchrotron x-ray powder diffraction studies on samples of La2−xMxCuO4 (M = Sr,Ba) prepared by standard ceramic techniques show that macroscopic compositional inhomogeneities may exist that are unlikely to be revealed by conventional x-ray diffraction methods. Rietveld refinement of neutron data collected at 200, 50, and 11 K from one such sample, nominally La1.8Sr0.2CuO4, gave satisfactory fits to a tetragonal structure of K2NiF4 type at all three temperatures. However, careful individual peak fits revealed that part of the sample transforms to orthorhombic between 200 and 50 K. It is suggested that this multiphase character has an important influence on the superconducting properties.

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Articles
Information
Journal of Materials Research , Volume 3 , Issue 6 , December 1988 , pp. 1327 - 1335
Copyright
Copyright © Materials Research Society 1988

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References

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