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Fe Substituted, Laser Ablated YBa2Cu3O7 films using Off-Stoichiometric Targets

Published online by Cambridge University Press:  16 February 2011

Frank Bridges ,
J. Truher ,
D. K. Fork ,
J. B. Boyce ,
D. B. Fenner ,
G. A. N. Connell ,
T. H. Geballe ,
S. Johnson  and
L. Liu
Frank Bridges
Affiliation:
Physics Department, University of California, Santa Cruz, CA 95064. Xerox Palo Alto Research Center, Palo Alto, CA 94304.
J. Truher
Affiliation:
Physics Department, University of California, Santa Cruz, CA 95064.
D. K. Fork
Affiliation:
Xerox Palo Alto Research Center, Palo Alto, CA 94304. Stanford University, Stanford, CA 94305.
J. B. Boyce
Affiliation:
Xerox Palo Alto Research Center, Palo Alto, CA 94304.
D. B. Fenner
Affiliation:
Xerox Palo Alto Research Center, Palo Alto, CA 94304. Physics Department, Santa Clara University, CA 95053.
G. A. N. Connell
Affiliation:
Xerox Palo Alto Research Center, Palo Alto, CA 94304.
T. H. Geballe
Affiliation:
Stanford University, Stanford, CA 94305.
S. Johnson
Affiliation:
Stanford Research Institute, Stanford CA 94305.
L. Liu
Affiliation:
Stanford Research Institute, Stanford CA 94305.
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Abstract

We present data on thin films of YBa2Cu3O7 (YBCO) and YBa2(Cu1−xFex)3O7 prepared by laser ablation using a sequence of targets, including Cu-deficient YBa2Cu2.4O7, CuO, and (CuO)1−y(FeO)y. This technique achieves mixing on an atomic scale. We find that stochiometric films, made using a combination of the Cudeficient target and CuO, have a sharp transition (width < 1K) near 90K although the Cu-deficient material alone has a broad transition at a lower Tc. We have achieved substitution of Fe on the Cu sites, using a sequence of the three targets for a range of Fe concentrations. Tc decreases nearly linearly with concentration and Tc → 0 near 15% Fe. The Tc suppression for the films is slightly less than the corresponding value obtained for bulk samples.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 191: Symposium N – Laser Ablation for Materials Synthesis , 1990 , 159
Copyright
Copyright © Materials Research Society 1990

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References

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