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Superconducting Properties of Orthorhombic YBa2(Cu1−xZnx)3O7 and Tetragonal YBa2(Cu1−xGax)3O7

Published online by Cambridge University Press:  28 February 2011

Gang Xiao ,
M. Z. Cieplak ,
A. Gavrin ,
F. H. Streitz ,
A. Bakhshai  and
C. L. Chien
Gang Xiao
Affiliation:
Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218
M. Z. Cieplak
Affiliation:
Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218
A. Gavrin
Affiliation:
Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218
F. H. Streitz
Affiliation:
Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218
A. Bakhshai
Affiliation:
Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218
C. L. Chien
Affiliation:
Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218
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Abstract

We have used Zn and Ga, two unique dopants having definite valence states and filled 3d levels, to probe the YBa2Cu3O7 superconductor. A small doping of Ga induces an orthorhombic to tetragonal structural transition, but the values of Tc are as high as 81 K in the tetragonal phase. YBa2(Cu1−xZnx)3O7 retains the same orthorhombic structure as the parent compound, but with highly depressed Tc. The oxygen vacancy order, or the linear chain structure, is found to be not essential for the high Tc. Our data suggest that Ga and Zn preferentially substitute Cu(1) and Cu(2) sites, which leads to the conclusion that the most important feature of the high Tc oxide superconductors is the Cu—O2 planes.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 99: Symposium AA – High-Temperature Superconductors , 1987 , 399
Copyright
Copyright © Materials Research Society 1988

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References

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