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Oxygen Order, Stoichiometry and Magnetic Behavior of YBa2(Cu1−xFex)3O7+δ

Published online by Cambridge University Press:  28 February 2011

C. W. Kimball ,
J. L. Matykiewicz ,
John Giapintzakis ,
Hsun Lee ,
B. D. Dunlap ,
M. Slaski ,
F. Y. Fradin ,
C. Segre  and
J. D. Jorgensen
C. W. Kimball
Affiliation:
Physics Dept., Northern Illinois University, DeKalb, IL 60115
J. L. Matykiewicz
Affiliation:
Physics Dept., Northern Illinois University, DeKalb, IL 60115
John Giapintzakis
Affiliation:
Physics Dept., Northern Illinois University, DeKalb, IL 60115
Hsun Lee
Affiliation:
Physics Dept., Northern Illinois University, DeKalb, IL 60115
B. D. Dunlap
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439
M. Slaski
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439
F. Y. Fradin
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439
C. Segre
Affiliation:
Physics Dept., Illinois Institute of Technology, Chicago, IL
J. D. Jorgensen
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439
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Abstract

Mössbauer effect and neutron diffraction measurements have been made as a function of composition for YBa2(Cu1−xFex)3O7+δ. A chemically driven disordering of the sublattices is observed with increasing Fe concentration which results in a transition from the orthorhombic to a tetragonal phase. However, as the occupancy of the oxygen site 0(1) in the chain is depleted and the site of the ordered vacancy 0(5) between the chains becomes occupied, the total oxygen content is not reduced but remains near seven in contrast to behavior observed in the quenched tetragonal phases. Mössbauer spectra for x =0.05 at temperatures below 15K show magnetic hyperfine splitting which is characteristic of a spin glass; i.e., a distribution of magnetic fields. It is inferred from Mössbauer results that Fe preferentially occupies the Cu(1) site.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 99: Symposium AA – High-Temperature Superconductors , 1987 , 107
Copyright
Copyright © Materials Research Society 1988

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References

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