High-temperature superconductor Ba2YCu3O7-¢L: plasmon and ultraviolet optical transition studies

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Abstract

We present the first electron energy loss data on a high-temperature superconductor. A detailed comparison with photoemission energy distribution curves and partial-yield spectra identifies the nature of the corresponding features. This analysis shows that the bulk plasmon energy is 24.6 eV, and that there are two peaks in the density of empty states, 2.3–2.5 eV and 4.3–4.6 eV above the Fermi level.

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