  NbP is a recently realized Weyl semimetal (WSM), hosting Weyl points through
which conduction and valence bands cross linearly in the bulk and exotic Fermi
arcs appear. However, the most intriguing transport phenomenon of a WSM, the
chiral anomaly-induced negative magnetoresistance (NMR) in parallel electric
and magnetic fields, has yet to be observed in NbP. In intrinsic NbP the Weyl
points lie far from the Fermi energy, making chiral magneto-transport elusive.
Here, we use Ga-doping to relocate the Fermi energy in NbP sufficiently close
to the Weyl points, for which the different Fermi surfaces are verified by
resultant quantum oscillations. Consequently, we observe a NMR for parallel
electric and magnetic fields, which is considered as a signature of the chiral
anomaly in condensed-matter physics. The NMR survives up to room temperature,
making NbP a versatile material platform for the development of Weyltronic
applications.
