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X-ray photoemission spectroscopy of the 90 K superconductor Ba2YCu3O7−δ

Published online by Cambridge University Press:  31 January 2011

Z. Iqbal ,
E. Leone ,
R. Chin ,
A. J. Signorelli ,
A. Bose  and
H. Eckhardt
Z. Iqbal
Affiliation:
Allied-Signal Inc., Corporate Technology, Morristown, New Jersey 07960
E. Leone
Affiliation:
Allied-Signal Inc., Corporate Technology, Morristown, New Jersey 07960
R. Chin
Affiliation:
Allied-Signal Inc., Corporate Technology, Morristown, New Jersey 07960
A. J. Signorelli
Affiliation:
Allied-Signal Inc., Corporate Technology, Morristown, New Jersey 07960
A. Bose
Affiliation:
Allied-Signal Inc., Corporate Technology, Morristown, New Jersey 07960
H. Eckhardt
Affiliation:
Allied-Signal Inc., Corporate Technology, Morristown, New Jersey 07960
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Abstract

The x-ray photoemission spectroscopie (XPS) data from different pelletized samples of the 90 K superconductor Ba2YCu3O7−δ (where δ∼0.2) have been obtained. The valence band spectrum (recorded at 300 and 170 K), which is composed of contributions from both the Cu 3d and O 2p levels, is compared with the full potential linearized augmented plane wave (FLAPW) calculated electronic density-of-states (DOS) reported by Massidda et al. and Mattheiss and Hamann. The experimental data indicate a relatively low DOS at the Fermi level. Detailed measurements of the core level Cu 2p, O 1s, Ba 3d, 4d, and Y 3d spectra of the superconducting and related standard materials, are presented. Data for the superconducting material were recorded in the freshly prepared form as well as after scraping in situ. The Cu 2p core level, satellite, and Auger spectra for the various samples were carefully examined in order to assess the possibility of the presence of Cu3+ ions in Ba2YCu3O7-δ. It is observed that surface reaction in air to form carbonates and hydroxides occurs readily in the superconducting material.

Type
Articles
Information
Journal of Materials Research , Volume 2 , Issue 6 , December 1987 , pp. 768 - 774
Copyright
Copyright © Materials Research Society 1987

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References

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