Extended Kohler’s Rule of Magnetoresistance in TaCo₂Te₂

TaCo₂Te₂ is recently reported to be an air-stable, high mobility Van der Waals material with probable magnetic order [1]. Here we investigate the scaling behavior of its magnetoresistance. We measured both the longitudinal and Hall magnetoresistivities of TaCo₂Te₂ crystals in magnetic fields parallel to the c-axis and found that the magnetoresistance violates the Kohler’s rule MR = f[H/ρ₀] while obeying the extended Kohler’s rule MR = f[H/(n_Tρ₀)] [2], where MR = [ρ_xx(H)-ρ₀]/ρ₀ with ρ_xx and ρ₀ being the longitudinal resistivities at a fixed temperature with and without the presence of a magnetic field H, respectively. n_T is a thermal factor governed by the temperature dependence of the carrier density, which can be experimentally determined from the Hall magnetoresistivities ρ_xy(H) obtained at various temperatures.

[1] R. Singha et al., TaCo₂Te₂: An Air-Stable, High Mobility Van der Waals Material with Probable Magnetic Order. Adv. Funct. Mater. 32, 2108920 (2022).

[2] J. Xu et al., Extended Kohler's Rule of Magnetoresistance. Physical Review X 11, 041029 (2021).