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Materials where the electronic bands have unusual topologies allow for therealization of novel physics and have a wide range of potential applications.When two electronic bands with linear dispersions intersect at a point, theexcitations could be described as Weyl fermions which are massless particleswith a particular chirality. Here we report evidence for the presence of Weylfermions in the ferromagnetic state of the low-carrier density, stronglycorrelated Kondo lattice system CeSb, from electronic structure calculationsand angle-dependent magnetoresistance measurements. When the applied magneticfield is parallel to the electric current, a pronounced negativemagnetoresistance is observed within the ferromagnetic state, which isdestroyed upon slightly rotating the field away. These results give evidencefor CeSb belonging to a new class of Kondo lattice materials with Weyl fermionsin the ferromagnetic state.

Possible Weyl fermions in the magnetic Kondo system CeSb