Abstract
A peak in the photoemission process is consistently observed at approximately 9 eV for the superconducting oxides with the feature being absent for CuO. A feature near 12 eV is observed for all the Cu +2 superconducting oxides. We find that the experimental spectra can be accounted for quantitatively with two-electron excitations in addition to the usual one-electron emission. In the two-electron process, a single photon causes one electron to be excited by approximately 8 eV due to a strong interband absorption while the second electron is photoemitted. The shake-up spectra at 9 and 12 eV then reflect the local densities of Cu and O states shifted by approximately 8 eV due to the second excitation. Our model is an alternative to the 5 parameters model based on the Cu-O atomic-like excitations, where it is assumed the 9 eV peak is spurious. Virtual shake-up transitions can be used as the coupling mechanism for the metallic oxide superconductors.
Published Version
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