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<br/>low residual resistivities and high mobilities, which are consistent with Dirac-like quasiparticles. For an applied magnetic field (<i>μ</i>₀<i>H</i>) having a non-zero component along the electrical current, we find a large, positive, and linear in <i>μ</i>₀<i>H</i> longitudinal magnetoresistivity (LMR). The<br/>sign of the LMR and its linear dependence deviate from the behavior reported for the chiral-anomaly-driven LMR in Weyl semimetals.<br/>Interestingly, such anomalous LMR is consistent with predictions for the role of the anomaly in type-II Weyl semimetals. In contrast, the<br/>transverse or conventional magnetoresistivity (CMR for electric fields <i>E </i>⊥ <i>μ</i>₀<i>H</i>) is large and positive, increasing by 10³ − 10⁴ % as a function<br/>of <i>μ</i>₀<i>H</i> while following an anomalous, angle-dependent power law <i>ρ</i>_xx ∝ (<i>μ</i>₀<i>H</i>)ⁿ with <i>n</i>(<i>θ</i>) ≤ 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.