Intrinsic Berry Curvature Driven Anomalous Hall and Nernst Effect in Co₂MnSn

Magnetic topological semimetals often exhibit unusual electronic and thermal transport due to nontrivial bulk band crossings, enabling simultaneous realization of large anomalous Hall and Nernst conductivities (σxy and αxy). Here, a comprehensive experimental and theoretical study of the anomalous transport properties of ferromagnetic Co₂MnSn is reported. First-principles calculations reveal topological Weyl points producing significant Berry curvature, driving dominant intrinsic anomalous Hall/Nernst effects. Electronic and thermal transport measurements demonstrate robust anomalous transport with substantial conductivity values that persist at room temperature (σxy~ 500 S/cm, αxy~ 1.3 A/m/K). We also show how the chemical substitution (via tuning Fermi level) can boost these effects (up to σxy~ 1376 S/cm, αxy~ 1.49 A/m/K at 150 K). These findings position Co₂MnSn as a compelling platform for exploring topological transport phenomena and advancing next-generation thermoelectric and spintronic technologies.