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Scanning Tunneung Microscope Studies of Initial Epitaxial Growth of YBa2Cu3O7-δ Thin Films

Published online by Cambridge University Press:  25 February 2011

Xiang-Yang Zheng ,
D. H. Lowndes ,
Shen Zhu  and
R. J. Warmack
Xiang-Yang Zheng
Affiliation:
Department of Physics and Astronomy, The University of Tennessee, Knoxville, TN 37996
D. H. Lowndes
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6123
Shen Zhu
Affiliation:
Department of Physics and Astronomy, The University of Tennessee, Knoxville, TN 37996
R. J. Warmack
Affiliation:
Health and Safety Research Division, Oak Ridge, TN 37831-6123
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Abstract

The initial stages of epitaxial growth of laser ablated YBa2Cu3O7-δ (YBCO) thin films on (001) SrTiO3, LaAlO3, and MgO substrates, and on slightly miscut LaA1O3 and SrTiO3, have been studied with scanning tunneling microscopy (STM). Surface images show that the initial YBCO growth mode can be either of the Stranski- Krastanov or the Volmer-Weber type, depending on the film-substrate lattice mismatch and the growth temperature. A small substrate miscut angle is found to strongly influence the growth mode of YBCO films. Screw dislocation-mediated growth is suppressed, and films grown at 800°C on (001) LaAlO3 substrates with miscut angle of 2.0° along <100> or <110> directions were found to consist of tilted platelets that are epitaxially aligned with the substrate crystal lattice.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 263: Symposium F – Mechanisms of Heteroepitaxial Growth , 1992 , 41
Copyright
Copyright © Materials Research Society 1992

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References

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