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Growth and Properties of Epitaxial YBa2Cu3O7 thin Films on{1102}Al2O3

Published online by Cambridge University Press:  28 February 2011

D. K. Fork ,
T. H. Geballe ,
K. Char ,
S. S. Laderman ,
R. Taber ,
F. Bridges ,
F. Ponce ,
J. B. Boyce  and
G. A. N. Connell
D. K. Fork
Affiliation:
Dept. of Applied Physics, Stanford University, Stanford, CA 94305
T. H. Geballe
Affiliation:
Dept. of Applied Physics, Stanford University, Stanford, CA 94305
K. Char
Affiliation:
Conductus, Inc., Sunnyvale, CA 94086
S. S. Laderman
Affiliation:
Circuit Technology R&D, Hewlett‐Packard Company, Palo Alto, CA 94304
R. Taber
Affiliation:
Circuit Technology R&D, Hewlett‐Packard Company, Palo Alto, CA 94304
F. Bridges
Affiliation:
Dept. of Physics, University of California, Santa Cruz, CA
F. Ponce
Affiliation:
Xerox Palo Alto Research Center, Palo Alto, CA 94304
J. B. Boyce
Affiliation:
Xerox Palo Alto Research Center, Palo Alto, CA 94304
G. A. N. Connell
Affiliation:
Xerox Palo Alto Research Center, Palo Alto, CA 94304
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Abstract

Epitaxial YBa2Cu3O7 (YBCO) films were grown on r‐plane A12O3 {1102} by laser ablation. X‐ray diffraction shows that films are epitaxial with the c‐axis perpendicular to the substrate and the a or b axes parallel to (2201), although the full width at half maximum of the rocking curve is larger compared to those of epitaxial films on SrTiO3. The critical temperatures (zero resistance) are between 85 K and 88 K with transition widths between 0.5 K and 3 K. The 300 K resistivity of 250 μΩextrapolates to zero at zero temperature and the critical current is as high as 5 x 106 A/cm2 at 4.2 K according to magnetization hysteresis measurements. Surface resistance data shows that 2000 Å thick epitaxial films on {1102} have about 1 mΩ at 13 GHz at 4.2 K.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 169: Symposium M – High Temperature Superconductors: Fundamental Properties and Novel Materials Processing , 1989 , 473
Copyright
Copyright © Materials Research Society 1990

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References

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