Fig. 1: Anisotropic transport in NbP.

a In isotropic conductors (top), a spherical Fermi surface (FS, as labeled in the figure) leads to uniform electron velocity distribution, resulting in random velocity orientations after surface scattering. In directional conductors (bottom), an anisotropic oriented FS aligns most electron velocities close to the transport direction, increasing the mean free path between surface scattering events. b Scanning Electron Microscope (SEM) images schematically showing the relative orientation of four NbP lamellae extracted from a single crystals. The chosen axes orientations enable transport measurements with the current and magnetic field applied along any principal axis. c Temperature-dependent electrical resistivity of the NbP samples, with transport directions aligned along different principal axes of the NbP crystal. d Power spectral density (normalized to largest peak) of SdH oscillations extracted from magnetoresistance measurements on the NbP samples, having the magnetic field B applied along different crystallographic directions.