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Ordered Oxygen Arrangements in Y1Ba2Cu3O7−x

Published online by Cambridge University Press:  21 February 2011

R. Beyers ,
B.T. Ahn ,
G. Gorman ,
V.Y. Lee ,
S.S.P. Parkin ,
M.L. Ramirez ,
K.P. Roche ,
J.E. Vazquez ,
T.M. Gür  and
R.A. Huggins
R. Beyers
Affiliation:
IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, CA 95120
B.T. Ahn
Affiliation:
IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, CA 95120
G. Gorman
Affiliation:
IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, CA 95120
V.Y. Lee
Affiliation:
IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, CA 95120
S.S.P. Parkin
Affiliation:
IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, CA 95120
M.L. Ramirez
Affiliation:
IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, CA 95120
K.P. Roche
Affiliation:
IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, CA 95120
J.E. Vazquez
Affiliation:
IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, CA 95120
T.M. Gür
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305
R.A. Huggins
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305
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Abstract

We describe the ordered oxygen arrangements in Y1Ba2Cu3O7−x samples prepared in precisely controlled oxygen environments using a solid-state ionic tehnique. The so-called “Ortho II”phase, characterized by a 〈1/200〉 superlattice wave vector, exists at oxygen contents from 6.28 to 6.65, with electrical properties that range from insulating to superconducting at up to 60 K. Additional ordered structures occur at oxygen contents from 6.65 to 6.90. All of the ordered structures are consistent with the removal of entire chains of oxygen along the b axis, which minimizes the number of three-fold coordinated copper and creates Cu+1 ions even in oxygen-rich samples. We found no evidence for phase separation between 6.0 and 7.0 or between 6.5 and 7.0. Phase separation, if it occurs at all, occurs on the 60 K and 90 K plateaus.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 156: Symposium M – High Temperature Superconductors: Relationships Between Properties, Structure, and Solid State Chemistry , 1989 , 77
Copyright
Copyright © Materials Research Society 1989

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References

REFERENCES

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