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Near-surface stoichiometry of high temperature superconducting YBaCuO thin films

Published online by Cambridge University Press:  31 January 2011

A. J. Drehman ,
M. W. Dumais ,
J. A. Horrigan ,
G-C. Wang  and
Y-F. Liew
A. J. Drehman
Affiliation:
Solid State Sciences Directorate, Rome Air Development Center, Hanscom AFB, Massachusetts 01731
M. W. Dumais
Affiliation:
Solid State Sciences Directorate, Rome Air Development Center, Hanscom AFB, Massachusetts 01731
J. A. Horrigan
Affiliation:
Solid State Sciences Directorate, Rome Air Development Center, Hanscom AFB, Massachusetts 01731
G-C. Wang
Affiliation:
Department of Physics, Rensselaer Polytechnic Institute, Troy, New York 12180-3590
Y-F. Liew
Affiliation:
Department of Physics, Rensselaer Polytechnic Institute, Troy, New York 12180-3590
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Abstract

The surface morphology and near-surface chemical composition of high temperature superconducting Y–Ba–Cu–O thin films have been studied by Scanning Electron Microscopy (SEM) and Auger Electron Spectroscopy (AES) depth profiling. These films were fabricated on SrTiO3 substrates by RF diode sputter deposition and subsequent furnace annealing in oxygen. The chemical composition at and near the surface of thin films was found to differ from the bulk composition. At about 500 Å below the surface the Y, Ba, and Cu stoichiometry, as determined by AES, gradually approach that of the film interior. These results suggest that, for furnace annealed films, there may exist a minimum deposited Y–Ba–Cu–O film thickness in which superconductivity is possible. It was also found that the calculated copper concentration determined by AES during depth profiling is significantly lower than its actual value.

Type
Articles
Information
Journal of Materials Research , Volume 5 , Issue 7 , July 1990 , pp. 1392 - 1396
Copyright
Copyright © Materials Research Society 1990

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