Photoelectron spectra of thin films of the high-T
c superconductor YBa2Cu3O7−δ |
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Authors: | E R Likhachev S I Kurganskii O I Dubrovskii A M Bugakov |
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Institution: | (1) Voronezh State University, 394693 Voronezh, Russia |
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Abstract: | The results of calculations of the energy band structure of thin films are used to obtain theoretical photoelectron spectra
of the valence band of the compound YBa2Cu3O7−δ
for δ=0 and δ=1 at various photon energies; the spectra are averaged over the photoelectron emission angles. The principal structural features
of the spectra are determined by the d states of copper atoms, while the variation of the shape of the spectra with increasing photon energy is attributed to a
relative decrease in the contribution from the p states of oxygen atoms. The density of d states around the Fermi level for YBa2Cu3O6 films is observed to increase relative to YBa2Cu3O7 films.
Fiz. Tverd. Tela (St. Petersburg) 39, 437–440 (March 1997) |
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