Oxygen 1s core-level photoemission as a tool to investigate the unoccupied electronic states of cuprates

Kozo Okada, Akio Kotani

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

We theoretically show that the oxygen 1s x-ray photoelectron spectrum (O 1s XPS) directly refelcts the unoccupied part of the electronic states of strongly correlated oxides. On the basis of numerically exact diagonalization calculations performed using a finite-size cluster model, we study the electron- or hole-doping dependence of the O 1s XPS of two-dimensional copper compounds in detail. The O 1s XPS has a weak charge-transfer (CT) satellite structure, which is located at about 10 eV above the main line. In this CT final state, an O 2p valence electron ejected by the O 1s core hole potential is transferred to the conduction states. Thus, the line shape of the CT satellite reflects the upper Hubbard band for electron-doped or undoped cuprates and also the Zhang-Rice singlet band for hole-doped cuprates.

Original languageEnglish
Article number123703
Journaljournal of the physical society of japan
Volume75
Issue number12
DOIs
Publication statusPublished - Dec 2006

Keywords

  • Charge transfer
  • Cuprate
  • Electron correlation
  • Hubbard band
  • O 1s core-level photoemission
  • Zhang-Rice singlet
  • dp model

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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