We report a comprehensive study of the magnetic, magnetotransport, and Hall transport properties of the quaternary Heusler alloy CoRuFeSi. The compound has a saturation magnetization of 4.21 ${\mu }_B$/f.u. and is classified as a soft ferromagnet at room temperature. The longitudinal resistivity exhibits an upturn at low temperatures, a signature of electron-electron interactions. Further, half-metallic nature is supported by the absence of a quadratic temperature dependency at higher temperatures, which agrees well with first-principles electronic structure calculations. A key finding of this work is the observation of a nearly temperature-independent anomalous Hall conductivity of $\sim 74$ S/cm at room temperature, dominated by the intrinsic contribution. First-principles calculations reveal a nodal-line semimetallic electronic structure, and inclusion of Co-Ru antisite disorder yields intrinsic anomalous Hall conductivity in excellent agreement with experiment, highlighting the role of disorder in tuning Berry curvature. These results establish CoRuFeSi as a disorder-tolerant half-metal with a robust anomalous Hall response at room temperature, providing insight into the interplay between disorder, topology, and transport in quaternary Heusler systems and highlighting its potential for spintronic applications.

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• Band gap
• Density of states
• Electronic structure of atoms & molecules
• Fermi surface
• Hall effect
• Magnetic anisotropy
• Magnetotransport
• Spin polarization
• Spin-orbit coupling
• Spintronics
• Symmetry protected topological states
• Topological materials
• First-principles calculations