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Hallmarks of Hunds coupling in the Mott insulator Ca2RuO4

Author

Listed:
  • D. Sutter

    (Physik-Institut, Universität Zürich)

  • C. G. Fatuzzo

    (Institute of Physics, École Polytechnique Fedérale de Lausanne (EPFL))

  • S. Moser

    (Advanced Light Source (ALS))

  • M. Kim

    (College de France
    Centre de Physique Théorique, Ecole Polytechnique, CNRS, Univ Paris-Saclay)

  • R. Fittipaldi

    (CNR-SPIN
    Università di Salerno)

  • A. Vecchione

    (CNR-SPIN
    Università di Salerno)

  • V. Granata

    (CNR-SPIN
    Università di Salerno)

  • Y. Sassa

    (Uppsala University)

  • F. Cossalter

    (Physik-Institut, Universität Zürich)

  • G. Gatti

    (Institute of Physics, École Polytechnique Fedérale de Lausanne (EPFL))

  • M. Grioni

    (Institute of Physics, École Polytechnique Fedérale de Lausanne (EPFL))

  • H. M. Rønnow

    (Institute of Physics, École Polytechnique Fedérale de Lausanne (EPFL))

  • N. C. Plumb

    (Swiss Light Source, Paul Scherrer Institut)

  • C. E. Matt

    (Swiss Light Source, Paul Scherrer Institut)

  • M. Shi

    (Swiss Light Source, Paul Scherrer Institut)

  • M. Hoesch

    (Diamond Light Source)

  • T. K. Kim

    (Diamond Light Source)

  • T-R Chang

    (National Tsing Hua University
    National Cheng Kung University)

  • H-T Jeng

    (National Tsing Hua University
    Institute of Physics, Academia Sinica)

  • C. Jozwiak

    (Advanced Light Source (ALS))

  • A. Bostwick

    (Advanced Light Source (ALS))

  • E. Rotenberg

    (Advanced Light Source (ALS))

  • A. Georges

    (College de France
    Centre de Physique Théorique, Ecole Polytechnique, CNRS, Univ Paris-Saclay
    University of Geneva)

  • T. Neupert

    (Physik-Institut, Universität Zürich)

  • J. Chang

    (Physik-Institut, Universität Zürich)

Abstract

A paradigmatic case of multi-band Mott physics including spin-orbit and Hund’s coupling is realized in Ca2RuO4. Progress in understanding the nature of this Mott insulating phase has been impeded by the lack of knowledge about the low-energy electronic structure. Here we provide—using angle-resolved photoemission electron spectroscopy—the band structure of the paramagnetic insulating phase of Ca2RuO4 and show how it features several distinct energy scales. Comparison to a simple analysis of atomic multiplets provides a quantitative estimate of the Hund’s coupling J=0.4 eV. Furthermore, the experimental spectra are in good agreement with electronic structure calculations performed with Dynamical Mean-Field Theory. The crystal field stabilization of the dxy orbital due to c-axis contraction is shown to be essential to explain the insulating phase. These results underscore the importance of multi-band physics, Coulomb interaction and Hund’s coupling that together generate the Mott insulating state of Ca2RuO4.

Suggested Citation

  • D. Sutter & C. G. Fatuzzo & S. Moser & M. Kim & R. Fittipaldi & A. Vecchione & V. Granata & Y. Sassa & F. Cossalter & G. Gatti & M. Grioni & H. M. Rønnow & N. C. Plumb & C. E. Matt & M. Shi & M. Hoesc, 2017. "Hallmarks of Hunds coupling in the Mott insulator Ca2RuO4," Nature Communications, Nature, vol. 8(1), pages 1-7, August.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms15176
    DOI: 10.1038/ncomms15176
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    Cited by:

    1. Eun Kyo Ko & Sungsoo Hahn & Changhee Sohn & Sangmin Lee & Seung-Sup B. Lee & Byungmin Sohn & Jeong Rae Kim & Jaeseok Son & Jeongkeun Song & Youngdo Kim & Donghan Kim & Miyoung Kim & Choong H. Kim & Ch, 2023. "Tuning orbital-selective phase transitions in a two-dimensional Hund’s correlated system," Nature Communications, Nature, vol. 14(1), pages 1-9, December.

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