Intrinsic Berry Curvature Driven Anomalous Hall and Nernst Effect in Co${}_2$MnSn

Abstract

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 (${\sigma }_{xy}$ and ${\alpha }_{xy}$). Here, a comprehensive experimental and theoretical study of the anomalous transport properties of ferromagnetic Co${}_2$MnSn 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 (${\sigma }_{xy}\sim$ 500 S/cm, ${\alpha }_{xy}\sim$ 1.3 A/m/K). We also show how the chemical substitution (via tuning Fermi level) can boost these effects (up to ${\sigma }_{xy}\sim$ 1376 S/cm, ${\alpha }_{xy}\sim$ 1.49 A/m/K at 150 K). These findings position Co${}_2$MnSn as a compelling platform for exploring topological transport phenomena and advancing next-generation thermoelectric and spintronic technologies.

Bishal Das and Arnab Bhattacharya contributed equally to this work. 17 pages (11 pages main, 6 pages supplement), 11 figures (4 figures main, 7 figures supplement)

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