Abstract
We report an observation of Weyl fermions in momentum space in an itinerant ferromagnet SrRuO3 single crystal via inelastic optical spectroscopy. A clear magnetic resonance around 200 GHz is observed in the Brillouin light scattering spectra, which corresponds to the ferromagnetic resonance at the Γ point. The spin-wave gap shows non-monotonous temperature dependence distinct from the bulk magnetization. The observed peculiar temperature evolution in the spin-wave gap scales with that of the anomalous Hall conductivity, which is a hallmark of Weyl fermions near the Fermi energy.
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