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We present ambient and high-pressure electrical transport and structuralproperties of recently discovered magnetic Weyl semimetal PrAlGe. Electricalresistivity at ambient pressure shows an anomaly at $T_C$ = 15.1 K related tothe ferromagnetic transition. Anomalous Hall effect (AHE) is observed below$T_C$. We observe a 1.4 K/GPa increase of $T_C$ with pressure, resulting in$T_C$ $\approx$ 47 K at 23.0 GPa. Strong competition between Lorentz force andspin-scattering mechanisms suppressed by magnetic field is deduced from themagnetoresistance measurements under pressure. As in the ambient pressure case,the AHE is found to be present below $T_C$ up to the highest applied pressure.We observe a clear anomaly in the pressure dependence of $T_C$,magnetoresistance and Hall effect at 12.5 GPa suggesting the occurrence of apressure-induced electronic transition at this pressure. X-ray diffraction(XRD) experiment under pressure revealed the lattice structure to be stable upto $\sim$19.6 GPa with the absence of any symmetry changing structural phasetransition from the initial $I4_1md$ structure. Careful analysis of thepressure dependent XRD data reveal an isostructural transition near 11 GPa.Observed isostructural transition may be related to the pressure-inducedelectronic transition deduced from the magnetoresistance and Hall effect data.

Ambient and high-pressure electrical transport and structural investigations of magnetic Weyl semimetal PrAlGe