Anomalous magnetotransport behavior in single-crystal VSb2

We report the anomalous magnetotransport properties in high-quality single-crystal VSb2 without V atom vacancies. VSb2 shows typical metallic behavior with convex-upward characteristics, which can be explained using a parallel-resistor model. The three-dimensional weak antilocalization effect leads to a large saturation magnetoresistance (MR) up to 595%, which disappears when the magnetic field is along the ab plane. Instead, a clear Shubnikov-de Haas oscillation at low temperatures is observed, based on which the fast Fourier transformation spectrum analyses reveal three fundamental frequencies. The two-carrier fitting of Hall resistivity suggests that the saturation MR originates from the giant magnitude difference of the two carrier concentrations. Moreover, the angle-resolved magnetoresistance is measured by rotating the sample around its c axis and ab plane. A transition from twofold symmetry to isotropy is observed.