Abstract
Photoemission valence band spectra with three different photon energies (21.2 eV, 40.8 eV, 1253.6 eV) for Cu2O and CuO and a number of copper oxide based superconducting ceramics are investigated, namely La2CuO4 (LCO), Y1Ba2Cu3O7 (YBCO), Bi2Sr2CaCu2O8 (BSCCO) and Tl2Ba2Ca2Cu3O10 (TBCCO). From the Cu2O data it can be infered, that the He-II (40.8 eV) spectra give a fair representation of the density of states (DOS). In addition the agreement between the calculated density of states (DOS) and the He-II photoemission spectrum is almost perfect for Cu2O. This agreement is worse for CuO and the other materials which all have a Cu groundstate close to a 3d 9 configuration indicating a large contribution of thed-d correlation energy to the excitation spectra which is absent in Cu2O because of the filled 3d-shell. In all cases the experimental DOS atE F is very small and only the spectra of BSCCO show a well defined Fermi edge. The relevance of these findings with respect to the theoretical local functional density DOS calculations is discussed.
Published Version
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