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Comparison of Ba2YCu3O7−δ thin films grown on various perovskite substrates by coevaporation

Published online by Cambridge University Press:  31 January 2011

Julia M. Phillips
Affiliation:
AT&T Bell Laboratories, Murray Hill, New Jersey 07974
M.P. Siegal
Affiliation:
AT&T Bell Laboratories, Murray Hill, New Jersey 07974
R.B. van Dover
Affiliation:
AT&T Bell Laboratories, Murray Hill, New Jersey 07974
T.H. Tiefel
Affiliation:
AT&T Bell Laboratories, Murray Hill, New Jersey 07974
J.H. Marshall
Affiliation:
AT&T Bell Laboratories, Murray Hill, New Jersey 07974
C.D. Brandle
Affiliation:
AT&T Bell Laboratories, Murray Hill, New Jersey 07974
G. Berkstresser
Affiliation:
AT&T Bell Laboratories, Murray Hill, New Jersey 07974
A.J. Strauss
Affiliation:
Lincoln Laboratory, Massachusetts Institute of Technology, Lexington, Massachusetts 02173
R.E. Fahey
Affiliation:
Lincoln Laboratory, Massachusetts Institute of Technology, Lexington, Massachusetts 02173
S. Sengupta
Affiliation:
Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
A. Cassanho
Affiliation:
Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
H.P. Jenssen
Affiliation:
Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
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Abstract

We have compared the quality of Ba2YCu3O7−δ (BYCO) films grown by the BaF2 process on (100) substrates of the perovskites LaAlO3, LaGaO3, NdAlO3, NdGaO3, LiBaF3, and SrTiO3. The films were grown by coevaporation of Y, Cu, and BaF2 followed by a two-stage anneal. The high temperature stage of the anneal, the part of the process during which the BYCO crystal structure and morphology develop, has been varied. LaAlO3 and SrTiO3 support much better films, both electrically and structurally, than the other substrates. Of the oxides, NdGaO3 supports the worst films, while films on LiBaF3 are nonconducting. These results emphasize the overriding importance of chemical compatibility in determining the suitability of a potential substrate material. Unless this criterion is satisfied, the issue of lattice matching is unimportant.

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Articles
Copyright
Copyright © Materials Research Society 1992

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References

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Comparison of Ba2YCu3O7−δ thin films grown on various perovskite substrates by coevaporation
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