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X-Ray Absorption Study of Y1Ba2Cu3O7 and Gd1Ba2Cu3O7 Superconductors

Published online by Cambridge University Press:  28 February 2011

J. B. Boyce ,
F. Bridges ,
T. Claeson ,
R. S. Howland  and
T. H. Geballe
J. B. Boyce
Affiliation:
Xerox Palo Alto Research Center, Palo Alto, CA 94304
F. Bridges
Affiliation:
Department of Physics, University of California, Santa Cruz, CA 95064
T. Claeson
Affiliation:
3Physics Department, Chalmers Univ. of Techn., S-41296 Gothenburg, Sweden
R. S. Howland
Affiliation:
Department of Applied Physics, Stanford University, Stanford, CA 94305
T. H. Geballe
Affiliation:
Department of Applied Physics, Stanford University, Stanford, CA 94305
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Abstract

X-ray absorption measurements of the high-Tc superconductors Y1Ba2Cu3O7-δ and Gd1Ba2Cu3O7-δ are essentially identical and show no significant difference in either near-edge or local structure from 4.2K to 688K. The position of the Cu edge suggests that the Cu valence in the superconductors is between that in CuO (formal valence of II) and that in KCuO2 (formal valence of III). Our EXAFS structural results agree well with the diffraction data. From the atomic vibrations, we find that the 2D Cu-O planes and the ID Cu-O chains form the most rigid parts of the structure, with an Einstein temperature of about 560K, compared with 390K for the Y-O bonds, 320K for Ba-O, and 260K for Cu-Cu and Y-Cu.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 99: Symposium AA – High-Temperature Superconductors , 1987 , 943
Copyright
Copyright © Materials Research Society 1988

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References

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