Fig. 3. Negative longitudinal magnetoresistance from the chiral anomaly of multifold fermions.

a Result of the squeeze test. The small variation of the longitudinal magnetoresistance upon changing the probing contact geometries demonstrates that the measured phenomenon is intrinsic to the material. b Dependence of the resistivity at an applied magnetic field of B = 9 T on the angle θ = ∠(B, E) at various temperatures. Dashed lines are fits to the expected cos²(θ) dependence. c Normalized conductance variation measured at 2 K, as a function of the applied magnetic field for some angles θ between B and E. d At small angles θ, the magnetoconductivity increases quadratically with magnetic field (σ − σ₀)/σ₀ = αB². The parabolic coefficient α increases as ${\cos }^2\left(\theta \right)$, as expected for the chiral anomaly. e Longitudinal magnetoconductance at various temperatures together with parabolic fits (black dashed lines). f Internode scattering time τ_v over intranode scattering time τ as function of temperature extracted using the fits in e and Eq. (1).