We report X-ray photoemission data from YBa2Cu3O7 showing that the measured composition and the electronic structure depend significantly upon the photo-electron escape depth. For large take-off angles the valence band spectrum near the Fermi edge is well structured and shows a number of features, arising from Cu---O hybrid states. Their intensities are drastically reduced in the energy distribution curves measured at grazing angles. The results are interpreted assuming that the surface is mainly composed by Ba---O planes. This interpretation is shown to be consistent with electronic structure calculations for the bulk and the Ba---O surface.
SURFACE AND MIXED-VALENCE EFFECTS IN XPS SPECTRA FROM YBCO / Parmigiani, F; Samoggia, G; CALANDRA BUONAURA, Carlo. - In: PHYSICA. C, SUPERCONDUCTIVITY. - ISSN 0921-4534. - STAMPA. - 162:(1989), pp. 1385-1386.
SURFACE AND MIXED-VALENCE EFFECTS IN XPS SPECTRA FROM YBCO
CALANDRA BUONAURA, Carlo
1989
Abstract
We report X-ray photoemission data from YBa2Cu3O7 showing that the measured composition and the electronic structure depend significantly upon the photo-electron escape depth. For large take-off angles the valence band spectrum near the Fermi edge is well structured and shows a number of features, arising from Cu---O hybrid states. Their intensities are drastically reduced in the energy distribution curves measured at grazing angles. The results are interpreted assuming that the surface is mainly composed by Ba---O planes. This interpretation is shown to be consistent with electronic structure calculations for the bulk and the Ba---O surface.
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