Extended Kohler's Rule of Magnetoresistance in TaCo_2Te_2

TaCo_2Te_2 is recently reported to be an air-stable, high mobility Van der Waals material with probable magnetic order. Here we investigate the scaling behavior of its magnetoresistance. We measured both the longitudinal (ρ_xx) and Hall (ρ_xy) magnetoresistivities of TaCo_2Te_2 crystals in magnetic fields parallel to the c-axis and found that the magnetoresistance violates the Kohler's rule MR ∼ f[H/ρ_0] while obeying the extended Kohler's rule MR ∼ f[H/(n_Tρ_0)], where MR ∼ [ρ_xx(H)-ρ_0]/ρ_0, H is the magnetic field, n_T is a thermal factor, ρ_xx(H) and ρ_0 are the resistivities at H and zero field, respectively. While deviating from those of the densities of electrons (n_e) and holes (n_h) obtained from the two-band model analysis of the magnetoconductivities, the temperature dependence of n_T is close to that of the Hall carrier densities n_H calculated from the slopes of ρ_xy(H) curves at low magnetic fields, providing a new way to obtain the thermal factor in the extended Kohler's rule.