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We have investigated magnetotransport properties of YRh6Ge4, which wasrecently predicted to be a triply degenerate nodal semimetal. We find itexhibits remarkable signatures of a chiral anomaly, manifested by largenegative longitudinal magnetoresistance, quadratic field dependence ofmagnetoconductance and planar Hall effect. Furthermore, we have also observedShubnikov-de Haas (SdH) quantum oscillations in the magnetoresistivitymeasurements on this material. The analyses of the SdH data reveal twopoint-like Fermi surfaces and these pockets are found to host nearly masslessfermions. The small size of these Fermi pockets is in a good agreement with thetheoretical prediction that the triply degenerate point in YRh6Ge4 is muchcloser to the Fermi level than previously demonstrated triply degenerate nodalsemimetals such as MoP and WC. These results suggest YRh6Ge4 may serve as amodel system to probe exotic properties of three-component fermions andunderstand their underlying physics.

Transport evidence of triply degenerate nodal semimetal YRh6Ge4