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Growth and characterization of Ba2YCu3O7−δ films in reduced oxygen partial pressures using the BaF2 post-annealing process

Published online by Cambridge University Press:  31 January 2011

M.P. Siegal ,
S.Y. Hou ,
Julia M. Phillips ,
T.H. Tiefel  and
J.H. Marshall
M.P. Siegal
Affiliation:
AT&T Bell Laboratories, 600 Mountain Avenue, Murray Hill, New Jersey 07974
S.Y. Hou
Affiliation:
AT&T Bell Laboratories, 600 Mountain Avenue, Murray Hill, New Jersey 07974
Julia M. Phillips
Affiliation:
AT&T Bell Laboratories, 600 Mountain Avenue, Murray Hill, New Jersey 07974
T.H. Tiefel
Affiliation:
AT&T Bell Laboratories, 600 Mountain Avenue, Murray Hill, New Jersey 07974
J.H. Marshall
Affiliation:
AT&T Bell Laboratories, 600 Mountain Avenue, Murray Hill, New Jersey 07974
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Abstract

Epitaxial films of Ba2YCu3O7−δ (BYCO), as thin as 250 Å and with Jc's approaching those for the best in situ grown films, can be formed by coevaporating BaF2, Y, and Cu followed by a two-stage anneal. These results extend the work of R. Feenstra et al. [J. Appl. Phys. 69, 6569 (1991)] for film thicknesses >2000 Å. This involves using low oxygen partial pressure [p(O2) = 4.3 Torr] during the high temperature portion of the anneal, which we vary from Ta = 600 to 950 °C. The BYCO melt line is seen to be the upper limit for Ta. The use of lower p(O2) shifts the window for stable BYCO film growth to lower temperature. The lower growth temperature required for the low p(O2) process allows the formation of smooth films with greater microstructural disorder than for films grown in p(O2) = 740 Torr at higher Ta, resulting in higher Jc values by a factor of four. The relationship between the Ta required to grow films with the strongest pinning force and p(O2) is log [p(O2)] ∝ Ta−1, independent of growth method (in situ or ex situ) over a range of five orders of magnitude in p(O2).

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 10 , October 1992 , pp. 2658 - 2666
Copyright
Copyright © Materials Research Society 1992

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References

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