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Pulsed Laser Deposition of Y1Ba2Cu3O7-δ?Thin Films in High Oxygen Partial Pressures

Published online by Cambridge University Press:  18 March 2011

Timothy J. Haugan ,
Paul N. Barnes ,
Rama M. Nekkanti ,
Iman Maartense ,
Lyle B. Brunke  and
John P. Murphy
Timothy J. Haugan
Affiliation:
Air Force Research Laboratory, 2645 Fifth Street, Suite 13, Wright-Patterson AFB, OH 45433-7919, U.S.A.
Paul N. Barnes
Affiliation:
Air Force Research Laboratory, 2645 Fifth Street, Suite 13, Wright-Patterson AFB, OH 45433-7919, U.S.A.
Rama M. Nekkanti
Affiliation:
Air Force Research Laboratory, 2645 Fifth Street, Suite 13, Wright-Patterson AFB, OH 45433-7919, U.S.A.
Iman Maartense
Affiliation:
Air Force Research Laboratory, 2645 Fifth Street, Suite 13, Wright-Patterson AFB, OH 45433-7919, U.S.A.
Lyle B. Brunke
Affiliation:
Air Force Research Laboratory, 2645 Fifth Street, Suite 13, Wright-Patterson AFB, OH 45433-7919, U.S.A.
John P. Murphy
Affiliation:
Air Force Research Laboratory, 2645 Fifth Street, Suite 13, Wright-Patterson AFB, OH 45433-7919, U.S.A.
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Abstract

Pulsed laser deposition of Yba2Cu3O7-δ?(YBCO) coated conductors was studied for the range of P(O2) from 120 mTorr to 1200 mTorr, higher than typically used oxygen partial pressures during deposition. The purpose of the investigation was to determine the sensitivity of YBCO film quality to varying P(O2) for scaled-up fabrication of long-length coated conductors. Deposition at high P(O2) (≥?400 mTorr) gave very high and more consistent critical temperatures (Tc ≈?92 ±?0.4 °K) than results obtained at lower oxygen partial pressures (≤?200 mTorr) as determined by magnetic susceptibility measurements. Typically, the lower partial pressures are used although the laser fluence used in this research (3.2 J/cm2) is higher than typical. Transport Jc's were consistantly high for a wide range of oxygen pressures, 5–8 ×?106 A/cm2 at 77 K, self-field for P(O2) = 200–1200 mTorr. These results indicate that pulsed laser deposition of YBCO is relatively insensitive to P(O2) at the higher pressures of oxygen considered.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 689: Symposium E – Materials for High-Temperature Superconductor Technologies , 2001 , E6.8
Copyright
Copyright © Materials Research Society 2002

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References

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