After a review of the understanding of resonant photoemission phenomena we present photoemission spectra from single phase YBa2Cu3O7-δ which have been measured in the photon energy range 17-130 eV, at T=80 K, T=300 K and intermediate temperatures using synchrotron radiation. Intense satellites associated with the Cu 3d and O 2p bands are observed to undergo resonances at the Cu 3p and O 2s core level excitation thresholds respectively indicating the presence of holes in the Cu and O hybrid bands on both Cu and O sites. The strong correlation effects for the valence electrons suggest that one electron calculations may not be appropriate for a detailed description of the electronic properties of this material.
Observation of Strong Electron Correlations in YBa2Cu3O7-δ by hν Dependent Photoelectron Spectroscopy / Y. Petroff, P. Thiry, G. Rossi, A. Revcolevschi, J. Jegoudez. - In: INTERNATIONAL JOURNAL OF MODERN PHYSICS B. - ISSN 0217-9792. - 1:3-4(1987), pp. 831-845. [10.1142/S0217979287001195]
Observation of Strong Electron Correlations in YBa2Cu3O7-δ by hν Dependent Photoelectron Spectroscopy
G. Rossi;
1987
Abstract
After a review of the understanding of resonant photoemission phenomena we present photoemission spectra from single phase YBa2Cu3O7-δ which have been measured in the photon energy range 17-130 eV, at T=80 K, T=300 K and intermediate temperatures using synchrotron radiation. Intense satellites associated with the Cu 3d and O 2p bands are observed to undergo resonances at the Cu 3p and O 2s core level excitation thresholds respectively indicating the presence of holes in the Cu and O hybrid bands on both Cu and O sites. The strong correlation effects for the valence electrons suggest that one electron calculations may not be appropriate for a detailed description of the electronic properties of this material.Pubblicazioni consigliate
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