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Origin of the ϕ ∼ ±9° peaks in YBa2Cu3O7−δ films grown on cubic zirconia substrates

Published online by Cambridge University Press:  31 January 2011

D. G. Schlom ,
E. S. Hellman ,
E.H. Hartford Jr. ,
C.B. Eom ,
J. C. Clark  and
J. Mannhart
D. G. Schlom
Affiliation:
Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802–5005
E. S. Hellman
Affiliation:
AT/T Bell Laboratories, Murray Hill, New Jersey 07974–0636
E.H. Hartford Jr.
Affiliation:
AT/T Bell Laboratories, Murray Hill, New Jersey 07974–0636
C.B. Eom
Affiliation:
AT/T Bell Laboratories, Murray Hill, New Jersey 07974–0636
J. C. Clark
Affiliation:
Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802–5005
J. Mannhart
Affiliation:
IBM Research Division, Zurich Research Laboratory, CH-8803 Ruschlikon, Switzerland
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Abstract

The c-axis oriented YBa2Cu3O7−δ films grown on (001) yttria-stabilized cubic zirconia (YSZ) substrates often contain domains whose in-plane alignment is rotated approximately 9° from the cube-on-cube epitaxial relationship, in addition to the more commonly observed 0° and 45° in-plane rotations. We have investigated the origin of this ∼9° orientation using in situ electron diffraction during growth and ex situ 4-circle x-ray diffraction. Our results indicate that the ∼9° orientation provides the most favorable lattice match between the interfacial (110)-oriented BaZrO3 epitaxial reaction layer, which forms between YBa2Cu3O7−δ and the YSZ substrate. If epitaxy occurs directly between YBa2Cu3O7−δ and the YSZ substrate, i.e., before the BaZrO3 epitaxial reaction layer is formed, the 0° and 45° domains have the most favorable lattice match. However, growth conditions that favor the formation of the BaZrO3 reaction layer prior to the nucleation of YBa2Cu3O7−δ lead to an increase in ∼9° domains. The observed phenomenon, which results from epitaxial alignment between the diagonal of a square surface net and the diagonal of a rectangular surface net, is a general method for producing in-plane misorientations, and has also been observed for the heteroepitaxial growth of other materials, including (Ba, K)BiO3/LaAlO3. The YBa2Cu3O7−δ/YSZ case involves epitaxial alignment between [111]BaZrO3 and [110]YSZ, resulting in an expected in-plane rotation of 11.3° to 9.7° for fully commensurate and for fully relaxed (110)BaZrO3 on (001)YSZ, respectively.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 6 , June 1996 , pp. 1336 - 1348
Copyright
Copyright © Materials Research Society 1996

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