Abstract
The electronic structure of the high temperature superconductors, YBa2-Cu3O7-x and Bi2Sr2CaCu2O8 have been studied by high energy electron energy-loss spectroscopy in transmission mode. We could derive the dielectric functions from the low energy loss spectra below ∼ 40eV. These dielectric functions give information on plasmons, interband transitions and low-lying core levels. From the core electron excitation spectra, we obtain information on the unoccupied electronic states.
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