Doping Evolution of Oxygen K-edge X-ray Absorption Spectra in Cuprate Superconductors

ORAL

Abstract

We study oxygen K-edge x-ray absorption spectroscopy (XAS) and investigate the validity of the Zhang-Rice Singlet (ZRS) picture in overdosed cuprate superconductors. Using large-scale exact diagonalization of the three-orbital Hubbard model, we observe the effect of strong correlations manifesting in a dynamical spectral weight transfer from the upper Hubbard band to the ZRS band. The quantitative agreement between theory and experiment highlights an additional spectral weight reshuffling due to core-hole interaction. Our results confirm the important correlated nature of the cuprates and elucidate the changing orbital character of the low-energy quasi-particles, but also demonstrate the continued relevance of the ZRS even in the overdosed region.

*This work is supported by the U.S. DOE under Contract No. DE-AC02-76SF00515.

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Authors

  • Cheng-Chien Chen Chen

    • Advanced Photon Source, Argonne National Laboratory
    • Argonne National Lab

  • Michael Sentef

    • Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory
    • Stanford Institute for Materials and Energy Science (SIMES), SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA

  • Yvonne Kung

    • SIMES, SLAC and Stanford University
    • Department of Physics, Stanford University

  • Chunjing Jia

    • Department of Applied Physics, Stanford, CA 94305
    • Department of Applied Physics, Stanford University
    • Stanford Institute for Materials and ENergy Sciences

  • Ronny Thomale

    • Institute of Theoretical Physics, EPFL
    • Stanford University
    • EPFL Lausanne

  • Brian Moritz

    • Stanford Institute of Materials and Energy Sciences, SLAC NATIONAL ACCELERATOR LABORATORY 2575 Sand Hill Road, Menlo Park, CA 94025
    • Northern Illinois University and the University of North Dakota
    • Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory

  • Arno Kampf

    • Center for Electronic Correlations and Magnetism, University of Augsburg

  • Thomas Devereaux

    • SLAC National Acceleratory Laboratory
    • Stanford University, Stanford CA 94305, USA
    • Stanford Institute of Materials and Energy Sciences, SLAC NATIONAL ACCELERATOR LABORATORY 2575 Sand Hill Road, Menlo Park, CA 94025
    • Stanford Institute for Materials and Energy Science, SLAC National Accelerator Laboratory
    • SLAC National Accelerator Lab and Stanford University
    • Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory