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Weyl fermions and spin dynamics of metallic ferromagnet SrRuO3

Author

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  • Shinichi Itoh

    (Institute of Materials Structure Science, High Energy Accelerator Research Organization, 1-1 Oho
    School of High Energy Science, Graduate University for Advanced Science)

  • Yasuo Endoh

    (Institute of Materials Structure Science, High Energy Accelerator Research Organization, 1-1 Oho
    RIKEN Center for Emergent Matter Science)

  • Tetsuya Yokoo

    (Institute of Materials Structure Science, High Energy Accelerator Research Organization, 1-1 Oho
    School of High Energy Science, Graduate University for Advanced Science)

  • Soshi Ibuka

    (Institute of Materials Structure Science, High Energy Accelerator Research Organization, 1-1 Oho)

  • Je-Geun Park

    (Seoul National University
    Center for Correlated Electron Systems, Institute for Basic Science)

  • Yoshio Kaneko

    (RIKEN Center for Emergent Matter Science)

  • Kei S. Takahashi

    (RIKEN Center for Emergent Matter Science)

  • Yoshinori Tokura

    (RIKEN Center for Emergent Matter Science
    University of Tokyo)

  • Naoto Nagaosa

    (RIKEN Center for Emergent Matter Science
    University of Tokyo)

Abstract

Weyl fermions that emerge at band crossings in momentum space caused by the spin–orbit interaction act as magnetic monopoles of the Berry curvature and contribute to a variety of novel transport phenomena such as anomalous Hall effect and magnetoresistance. However, their roles in other physical properties remain mostly unexplored. Here, we provide evidence by neutron Brillouin scattering that the spin dynamics of the metallic ferromagnet SrRuO3 in the very low energy range of milli-electron volts is closely relevant to Weyl fermions near Fermi energy. Although the observed spin wave dispersion is well described by the quadratic momentum dependence, the temperature dependence of the spin wave gap shows a nonmonotonous behaviour, which can be related to that of the anomalous Hall conductivity. This shows that the spin dynamics directly reflects the crucial role of Weyl fermions in the metallic ferromagnet.

Suggested Citation

  • Shinichi Itoh & Yasuo Endoh & Tetsuya Yokoo & Soshi Ibuka & Je-Geun Park & Yoshio Kaneko & Kei S. Takahashi & Yoshinori Tokura & Naoto Nagaosa, 2016. "Weyl fermions and spin dynamics of metallic ferromagnet SrRuO3," Nature Communications, Nature, vol. 7(1), pages 1-8, September.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms11788
    DOI: 10.1038/ncomms11788
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