Normal-state transport properties and quantum linear magnetoresistance in LaNiGa 2

LaNiGa₂ has attracted attention due to evidence of time-reversal symmetry breaking in the superconducting state, alongside symmetry-enforced Dirac band crossings and anomalous pressure-dependent superconducting properties. Here we investigate the normal-state transport properties through Hall effect and magnetoresistance measurements. Our analysis reveals multiband behavior dominated by electron and hole bands with similar charge densities and mobilities. Density functional theory calculations support this multiband picture and show reasonable agreement with the experimentally determined carrier densities that remain nearly constant across the measured temperature range, indicating no electronic phase transitions. At low temperatures and high fields, the magnetoresistance exhibits quadratic to linear field dependence, which deviates from conventional semiclassical transport behavior. Possible explanations including quantum transport effects resulting from small Fermi surface pockets and impeded circular motions are discussed.