We report the carrier-density dependence of the magnetotransport property in the correlated Dirac semimetal ${\mathrm{CaIrO}}_3$. In the dilute carrier density region ($n_{\mathrm{H}} \sim 2.2\times {10}^{16}{\mathrm{cm}}^{-3}$) at $2\mathrm{K}$, the mobility exceeds $1.0\times {10}^5{\mathrm{cm}}^2/\mathrm{Vs}$ at $2\mathrm{K}$, and the transverse magnetoresistance reaches $2000\%$ at $12\mathrm{T}$. The analysis of quantum oscillations and Hall conductivity shows that the Fermi velocity is nearly independent of the cross-sectional area of the Fermi surface, or equivalently the carrier density, supporting a $k$-linear dispersion of the Dirac node. The field dependence of magnetoresistivity is nearly $B$-linear in the moderate carrier density region ($n_{\mathrm{H}}\ge 4\times {10}^{16}{\mathrm{cm}}^{-3}$), but scales with $B^{\alpha }$ ($\alpha >2$) in the lower carrier density region. The variation of magnetoresistivity is likely affected by the enhanced long-range Coulomb interaction in the quantum limit, where Dirac electrons are subject to the magnetic confinement.

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• Magnetotransport
• Shubnikov-de Haas effect
• Topological phases of matter