Weyl fermions and spin dynamics of metallic ferromagnet SrRuO3

Shinichi Itoh (), Yasuo Endoh, Tetsuya Yokoo, Soshi Ibuka, Je-Geun Park, Yoshio Kaneko, Kei S. Takahashi, Yoshinori Tokura and Naoto Nagaosa
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Shinichi Itoh: Institute of Materials Structure Science, High Energy Accelerator Research Organization, 1-1 Oho
Yasuo Endoh: Institute of Materials Structure Science, High Energy Accelerator Research Organization, 1-1 Oho
Tetsuya Yokoo: Institute of Materials Structure Science, High Energy Accelerator Research Organization, 1-1 Oho
Soshi Ibuka: Institute of Materials Structure Science, High Energy Accelerator Research Organization, 1-1 Oho
Je-Geun Park: Seoul National University
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
Naoto Nagaosa: RIKEN Center for Emergent Matter Science

Nature Communications, 2016, vol. 7, issue 1, 1-8

Abstract: 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.

Date: 2016
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DOI: 10.1038/ncomms11788

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