Zhang-Rice singlet hopping on bipartite tetragonal CuO

ORAL

Abstract

In the superconducting cuprates, corner sharing CuO$_4$ plaquettes host the formation and propagation of the Zhang-Rice singlet. Adding a further Cu atom to the center of such plaquettes results in a rare edge sharing geometry. The cupric oxide CuO indeed crystallizes in a lower-symmetry monoclinic form. At beamline 7.0.1 of the Advanced Light Source, we have grown tetragonal CuO thin films by pulsed laser deposition. By in situ angle-resolved photoemission (ARPES), we show that the first ionization state is a singlet propagating on two nearly independent corner sharing sublattices, and we resolve an inter-plaquette coupling of the order of 100 meV.

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Authors

  • L. Moreschini

    • Advanced Light Source (ALS), Berkeley, USA

  • S. Moser

    • Ecole Polytechnique Federale de Lausanne (EPFL), Lausanne, Switzerland

  • H.-Y. Yang

    • Ecole Polytechnique Federale de Lausanne (EPFL), Lausanne, Switzerland

  • D. Innocenti

    • Universit\`a di Roma Tor Vergata, Roma, Italy

  • F. Fuchs

    • Julius-Maximilian University of W\"urzburg, W\"urzburg, Germany

  • N.H. Hansen

    • Julius-Maximilian University of W\"urzburg, W\"urzburg, Germany

  • Y.J. Chang

    • Advanced Light Source (ALS), Berkeley, USA

  • K.S. Kim

    • Advanced Light Source (ALS), Berkeley, USA

  • A. Bostwick

    • Advanced Light Source (ALS), Berkeley, USA

  • E. Rotenberg

    • Advanced Light Source (ALS), Berkeley, USA

  • F. Mila

    • Ecole Polytechnique Federale de Lausanne (EPFL), Lausanne, Switzerland

  • M. Grioni

    • Ecole Polytechnique Federale de Lausanne (EPFL), Lausanne, Switzerland