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The recent observation of Weyl fermions in the itinerant 4d ferromagneticperovskite SrRuO3 points to this material being a good platform for exploringnovel physics related to a pair of Weyl nodes in epitaxial heterostructures. Inthis letter, we report the thickness-dependent magnetotransport properties ofultra-high-quality epitaxial SrRuO3 films grown under optimized conditions onSrTiO3 substrates. Signatures of Weyl fermion transport, i.e., unsaturatedlinear positive magnetoresistance accompanied by a quantum oscillation having a{\pi} Berry phase, were observed in films with thicknesses as small as 10 nm.Residual resistivity increased with decreasing film thickness, indicatingdisorder near the interface between SrRuO3 and the SrTiO3 substrate. Since thisdisorder affects the magnetic and electrical properties of the films, the Curietemperature decreases and the coercive field increases with decreasingthickness. Thickness-dependent magnetotransport measurements revealed that thethreshold residual resistivity ratio (RRR) to observe Weyl fermion transport is21. These results provide guidelines for realizing quantum transport of Weylfermions in SrRuO3 near heterointerfaces.

Thickness-dependent quantum transport of Weyl fermions in ultra-high-quality SrRuO3 films