Oxygen 1<i>s</i> Core-Level Photoemission as a Tool to Investigate the Unoccupied Electronic States of Cuprates

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  • Okada Kozo
    The Graduate School of Natural Science and Technology, Okayama University
  • Kotani Akio
    RIKEN Photon Factory, IMSS, High Energy Accelerator Research Organization

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  • Oxygen 1s Core-Level Photoemission as a Tool to Investigate the Unoccupied Electronic States of Cuprates

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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.

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