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Proximity-Effect and Tunneling in YBa2Cu3O7/Metal Layered Structures

Published online by Cambridge University Press:  28 February 2011

L. H. Greene ,
W. L. Feldmann ,
J. B. Barrier ,
L. A. Farrow ,
P. F. Miceli ,
R. Ramesh ,
B. J. Wilkens ,
B. G. Bagley ,
M. Giroud  and
J.M. Rowell
L. H. Greene
Affiliation:
Bellcore, 331 Newman Springs Rd., Red Bank, NJ, 07701, USA
W. L. Feldmann
Affiliation:
Bellcore, 331 Newman Springs Rd., Red Bank, NJ, 07701, USA
J. B. Barrier
Affiliation:
Bellcore, 331 Newman Springs Rd., Red Bank, NJ, 07701, USA
L. A. Farrow
Affiliation:
Bellcore, 331 Newman Springs Rd., Red Bank, NJ, 07701, USA
P. F. Miceli
Affiliation:
Bellcore, 331 Newman Springs Rd., Red Bank, NJ, 07701, USA
R. Ramesh
Affiliation:
Bellcore, 331 Newman Springs Rd., Red Bank, NJ, 07701, USA
B. J. Wilkens
Affiliation:
Bellcore, 331 Newman Springs Rd., Red Bank, NJ, 07701, USA
B. G. Bagley
Affiliation:
Bellcore, 331 Newman Springs Rd., Red Bank, NJ, 07701, USA
M. Giroud
Affiliation:
CRTBT-CNRS, Grenoble, FR,
J.M. Rowell
Affiliation:
Conductus, Inc., Sunnyvale, CA, 94086, USA.
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Abstract

Superconducting thin films of YBa2Cu3O7 are prepared in-situ by on-axis, sputter deposition from a single, composite target. Our planar magnetron target composition of Y:Ba:Cu = 1.08:1.76:4.5 sputtered onto MgO at T~750°C in a 600mTorr Ar-O2 atmosphere yields reproducible superconducting films having Tc(R = 0)>80K and stoichiometry 1:2:3, that are shiny and of near epitaxial, crystalline quality. In order to ensure clean interfaces, YBa2Cu3O7/normal metal bilayers (to form SNS' Josephson junctions) and YBa2Cu3O7/normal metal/insulating barrier trilayers (to form SNIS' proximity tunnel junctions) are grown completely in-situ. (The S' = Pb counter electrode is evaporated ex-situ.) A supercurrent and Shapiro steps are observed in microwave irradiated SNS' (N = Ag) small area (5x10-5cm2) junctions. In SNIS' tunnel junctions, high-quality Pb tunneling is observed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 169: Symposium M – High Temperature Superconductors: Fundamental Properties and Novel Materials Processing , 1989 , 991
Copyright
Copyright © Materials Research Society 1990

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References

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