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Photoemission study of metallic but non-superconducting and insulating copper oxides

Authors
Journal
Physica C Superconductivity
0921-4534
Publisher
Elsevier
Publication Date
Identifiers
DOI: 10.1016/0921-4534(91)91750-x
Disciplines
  • Physics

Abstract

Abstract The electronic structure of the metallic but non-superconducting copper oxide La 4BaCu 5O 13 and formally Cu 3+ insulator NaCuO 2 is studied by photoemission spectroscopy and cluster model calculations. As for La 4BaCu 5O 13, a Fermi edge has been observed and the valence band and the Cu 2p core level spectra resemble those of Cu-oxide superconductors. From the analysis of the spectra of NaCuO 2, the charge transfer energy Δ is found to be negative and the band gap is of a p-p type.

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