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Extreme Sensitivity of Tc to Cool-Down Rate and Substrate Temperature for Epitaxial Fe-DOPED Ybco Films

Published online by Cambridge University Press:  26 February 2011

Frank Bridges ,
J. B. Boyce  and
R. I. Johnson
Frank Bridges
Affiliation:
Physics Department, University of California, Santa Cruz, CA 95064 Xerox Palo Alto Research Center, 3333 Coyote Hill Road, Palo Alto, CA 94304
J. B. Boyce
Affiliation:
Xerox Palo Alto Research Center, 3333 Coyote Hill Road, Palo Alto, CA 94304
R. I. Johnson
Affiliation:
Xerox Palo Alto Research Center, 3333 Coyote Hill Road, Palo Alto, CA 94304
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Abstract

Epitaxial Fe-substituted YBCO films on LaAIO3 substrates prepared by pulsed laser deposition exhibit a large variation in Tc with the substrate temperature and the cool-down rate of the films in an O2 environment, immediately after deposition. For 9% Fe films deposited at 700°C, a rapid cool-down yields a Tc of 60 K while a slow cool-down of 10°C/minute gives 18 K; Tc goes to 0 at 11% Fe for the slow cool-down films. For 9% Fe films deposited at 770°C, Tc > 80K and is much less sensitive to the cool-down rate or additional anneals.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 275: Symposium S – Layered Superconductors: Fabrication, Properties and Applications , 1992 , 143
Copyright
Copyright © Materials Research Society 1992

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References

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