Electric transport properties of Cu-doped NbTe2 single crystals

NbTe2 is a monoclinic quasi-two-dimensional layered semimetal. This paper reports the change of physical properties of NbTe2 single crystals under the action of copper substitution. The zero-field ab-plane resistivity ρxx shows that the samples havegood metallicity. Magnetoresistance changes of up to 23% were observed at a magnetic field of 13 T without any tendency to saturate. We have observed linear magnetoresistance under high magnetic field, which will be attributed to the linear band dispersion of small Fermi pockets. And we use a formula to describe the linear relationship: ρ=NiBπn2ec∝B. The curve of the Hall resistance changing with the magnetic field at the same temperature has a linear relationship with the magnetic field, and the slope is positive, which indicates that the carrier type is mainly hole-type carriers.