arXiv (Cornell University) · 2015 · 56 citations · 0 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsMagnetic MaterialsQuantum MechanicsExchange InteractionsMagnetic Properties Of SolidsMagnetism In SolidsSpintronicsTopological MaterialsMagnetic Exchange InteractionsMagnetic Topological MaterialsMagnetoresistanceSpin CouplingSpin-orbital CouplingSpin-spin CouplingTopological SemimetalsWeyl Semimetals
In this paper, we report the intercone transport of Weyl fermions in NbAs with external magnetic field in parallel to electric field, a quantum phenomenon known as the Adler-Bell-Jackiw anomaly. Surprisingly, the resulting negative magnetoresistance (MR) in NbAs shows significant difference from NbP. The observed low-field positive MR dip, which is missing in NbP at low temperatures, indicates that the spin-orbital coupling (SOC) is significantly stronger in NbAs than in the former. The results imply that the contribution of arsenic to SOC in TaAs and NbAs is not negligible.