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Electromagnon dispersion probed by inelastic X-ray scattering in LiCrO2

Author

Listed:
  • Sándor Tóth

    (Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute
    Laboratory for Quantum Magnetism, Institute of Physics, EPFL)

  • Björn Wehinger

    (Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute
    University of Geneva)

  • Katharina Rolfs

    (Laboratory for Scientific Developments and Novel Materials, Paul Scherrer Institute)

  • Turan Birol

    (University of Minnesota
    Rutgers University)

  • Uwe Stuhr

    (Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute)

  • Hiroshi Takatsu

    (Graduate School of Engineering, Kyoto University
    Tokyo Metropolitan University)

  • Kenta Kimura

    (Graduate School of Engineering Science, Osaka University)

  • Tsuyoshi Kimura

    (Graduate School of Engineering Science, Osaka University)

  • Henrik M. Rønnow

    (Laboratory for Quantum Magnetism, Institute of Physics, EPFL)

  • Christian Rüegg

    (Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute
    University of Geneva)

Abstract

Inelastic X-ray scattering with meV energy resolution (IXS) is an ideal tool to measure collective excitations in solids and liquids. In non-resonant scattering condition, the cross-section is strongly dominated by lattice vibrations (phonons). However, it is possible to probe additional degrees of freedom such as magnetic fluctuations that are strongly coupled to the phonons. The IXS spectrum of the coupled system contains not only the phonon dispersion but also the so far undetected magnetic correlation function. Here we report the observation of strong magnon–phonon coupling in LiCrO2 that enables the measurement of magnetic correlations throughout the Brillouin zone via IXS. We find electromagnon excitations and electric dipole active two-magnon excitations in the magnetically ordered phase and heavily damped electromagnons in the paramagnetic phase of LiCrO2. We predict that several (frustrated) magnets with dominant direct exchange and non-collinear magnetism show surprisingly large IXS cross-section for magnons and multi-magnon processes.

Suggested Citation

  • Sándor Tóth & Björn Wehinger & Katharina Rolfs & Turan Birol & Uwe Stuhr & Hiroshi Takatsu & Kenta Kimura & Tsuyoshi Kimura & Henrik M. Rønnow & Christian Rüegg, 2016. "Electromagnon dispersion probed by inelastic X-ray scattering in LiCrO2," Nature Communications, Nature, vol. 7(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms13547
    DOI: 10.1038/ncomms13547
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