Ferromagnetism and Intrinsic Anomalous Hall Effect in Centrosymmetric PrGaSi Single Crystals

Single crystals of PrGaSi (Praseodymium–Gallium–Silicon) were successfully grown using a high-temperature Ga flux technique, enabling a comprehensive study of their structural and magnetic properties. Single-crystal X-ray diffraction confirms a tetragonal centrosymmetric structure (space group I4₁/amd), characteristic of the RGaSi family. Magnetic and thermodynamic measurements reveal a transition to ferromagnetic order below T₍C₎ ≈ 22 K, with the magnetic moments aligned along the crystallographic c-axis, consistent with strong uniaxial anisotropy. The magnetization, magnetoresistance, and Hall-effect all exhibit pronounced directional dependence, underscoring the interplay between crystal symmetry and magnetic behavior. Notably, Hall transport measurements uncover a large anomalous Hall effect (AHE) below T₍C₎, where the anomalous contribution dominates over the ordinary term. The persistence of such a strong intrinsic AHE in a centrosymmetric lattice points to significant Berry curvature arising from spin–orbit coupling and exchange-split 4f–conduction electron bands. These findings establish PrGaSi as a valuable model system for investigating intrinsic anomalous transport in rare-earth ferromagnets.