Abstract
XPS and UPS photoemission experiments on the highT c superconductors (T c ≈90 K) with nominal composition YBa2Cu3O9-y (y≈2) show the following:
-
a)
The density of electronic states at the Fermi energy is very small, much smaller than in pure Cu.
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b)
The Cu 2p spectra show only a Cu2+ contribution.
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c)
The Ba core levels show a structure with two components of nearly equal magnitude, which leads to the suggestion that these compounds have large O2− vacancies coordinated to Ba2+ sites.
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d)
Annealing at 400°C under UHV conditions leads possibly to a partial reduction of Cu2+ to lower Cu valence states and to a small increase of the O2− vacancy component of the Ba2+ line.
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Steiner, P., Kinsinger, V., Sander, I. et al. Photoemission on the highT c superconductors Y−Ba−Cu−O. Z. Physik B - Condensed Matter 67, 19–23 (1987). https://doi.org/10.1007/BF01307302
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DOI: https://doi.org/10.1007/BF01307302