Evidence for The Chiral Anomaly in The Cubic Type-II Dirac Metal Pd₃In₇

We report a transport study on Pd₃In₇ which displays multiple Dirac type-II nodes in its electronic dispersion. Pd₃In₇ is characterized by
low residual resistivities and high mobilities, which are consistent with Dirac-like quasiparticles. For an applied magnetic field (μ₀H) having a non-zero component along the electrical current, we find a large, positive, and linear in μ₀H longitudinal magnetoresistivity (LMR). The
sign of the LMR and its linear dependence deviate from the behavior reported for the chiral-anomaly-driven LMR in Weyl semimetals.
Interestingly, such anomalous LMR is consistent with predictions for the role of the anomaly in type-II Weyl semimetals. In contrast, the
transverse or conventional magnetoresistivity (CMR for electric fields E ⊥ μ₀H) is large and positive, increasing by 10³ − 10⁴ % as a function
of μ₀H while following an anomalous, angle-dependent power law ρ_xx ∝ (μ₀H)ⁿ with n(θ) ≤ 1. The order of magnitude of the CMR, and its anomalous power-law, is explained in terms of uncompensated electron and hole-like Fermi surfaces characterized by anisotropic carrier scattering likely due to the lack of Lorentz invariance.