In this work, we investigated the magnetotransport and magnetic properties of GdGaSi, having a noncentrosymmetric tetragonal structure, with space group $I{4}_{1}md$. Our theoretical results are supported by experimental studies. First-principles calculations reveal that GdGaSi is an antiferromagnetic semimetallic system, characterized by dominant electron-type charge carriers. In addition, the possible nontriviality of the crossing at the Fermi energy is consistent with isostructural LaPtSi-structured materials. The compound shows robust antiferromagnetic (AFM) ordering with a Néel temperature of 19 K, and a spin-reorientation signature below $T_N$. The semimetallic nature with positive magnetoresistance ($\simeq$ 2% at 2 K and 8 T) is observed from the magnetotransport data, having electrons as the majority charge carrier, established from the Hall measurements. The strong correlation in magnetism and transport properties is supported by various observations, like (1) concordant transitions in $M\left(T\right)$ and $\rho \left(T\right)$ data, (2) change in the concentration and mobility of electrons below $T_N$, and (3) splitting of Kohler's plots in the two branches across the long-range magnetic transition. Thus, our findings establish GdGaSi as a material with intertwined magnetic and transport degrees of freedom, within a noncentrosymmetric lattice.

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• Density of states
• Electrical conductivity
• Electrical properties
• Fermi surface
• Hall effect
• Magnetic interactions
• Magnetic order
• Magnetic phase transitions
• Magnetic susceptibility
• Magnetism
• Magnetotransport
• Spin-orbit coupling