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Thin film deposition and interface characterization of YBCO on LiNbO3 substrates

Published online by Cambridge University Press:  03 March 2011

N.J. Wu ,
X.Y. Li ,
J. Li ,
H. Lin ,
H. Fredricksen ,
K. Xie ,
A. Mesarwi ,
A. Ignaticv  and
H.D. Shih
N.J. Wu
Affiliation:
Texas Center for Superconductivity and Space Vacuum Epitaxy Center, University of Houston, Houston, Texas 77204-5507
X.Y. Li
Affiliation:
Texas Center for Superconductivity and Space Vacuum Epitaxy Center, University of Houston, Houston, Texas 77204-5507
J. Li
Affiliation:
Texas Center for Superconductivity and Space Vacuum Epitaxy Center, University of Houston, Houston, Texas 77204-5507
H. Lin
Affiliation:
Texas Center for Superconductivity and Space Vacuum Epitaxy Center, University of Houston, Houston, Texas 77204-5507
H. Fredricksen
Affiliation:
Texas Center for Superconductivity and Space Vacuum Epitaxy Center, University of Houston, Houston, Texas 77204-5507
K. Xie
Affiliation:
Texas Center for Superconductivity and Space Vacuum Epitaxy Center, University of Houston, Houston, Texas 77204-5507
A. Mesarwi
Affiliation:
Texas Center for Superconductivity and Space Vacuum Epitaxy Center, University of Houston, Houston, Texas 77204-5507
A. Ignaticv
Affiliation:
Texas Center for Superconductivity and Space Vacuum Epitaxy Center, University of Houston, Houston, Texas 77204-5507
H.D. Shih
Affiliation:
Texas Instruments Inc., Corporate Research and Development, P.O. Box 655936, MS 150, Dallas, Texas 75265
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Abstract

High transition temperature superconducting YBa2Cu3O7−x (YBCO) thin films have been epitaxially grown on YZ-cut LiNbO3 (LNO) substrates by the pulsed laser deposition technique. The interface between YBCO and LNO has been systematically investigated by scanning electron microscopy, atomic force microscopy, Auger electron spectroscopy, and x-ray photoelectron spectroscopy. Off-stoichiometry LiNbOx phases are found to segregate on the substrate surface because of lithium and oxygen vacancies formed during the high temperature YBCO growth. These submicrometer particles are observed along the Z-axis on the X-Z plane of LNO with height of ∼30 nm above the LNO surface. This rough growth surface results in YBa2Cu3O7−x thin films grown on the LNO surface that have reduced Jc and Tc, possibly limiting the use of YBCO/LNO heterostructures for surface acoustic wave (SAW) devices.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 12 , December 1995 , pp. 3009 - 3015
Copyright
Copyright © Materials Research Society 1995

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