Large room temperature anomalous Hall and Nernst effects in Kagomé ZrFe2 ferromagnet

Recent progress in Kagomé-lattice metals has established these materials as an unique platform for exploring frustrated lattice geometries and quantum topological phenomena. In the present study, polycrystalline ZrFe₂ with Kagomé-lattice structure was synthesized, enabling systematic investigation of anomalous Hall and Nernst effects through comprehensive electrical, thermal, and thermoelectric measurements complemented by first-principles calculations. It is observed that ZrFe₂ is a ferromagnet with the Curie temperature T_C ∼623 K, which displays a two-dimensional Kagomé structure along the [111] direction and equivalent planes. Strikingly, large anomalous Hall conductivity (AHC, ${\sigma }_{xy}^A$ ∼382.4 Ω⁻¹ cm⁻¹) and anomalous Nernst conductivity (ANC, ${\alpha }_{yx}^A$ ∼2.1 A m⁻¹ K⁻¹) were obtained at room temperature (300 K). Theoretical analysis reveals that these prominent transport properties predominantly stem from the intrinsic Berry curvature (BC) mechanism. First-principles calculations further demonstrate substantial BC accumulation near the Fermi level E_F, providing fundamental insights into the origin of enhanced AHC and ANC. These findings not only expand the material exploration landscape for large anomalous Hall and Nernst effects but also highlight ZrFe₂ as a promising candidate for Hall-effect devices and thermoelectric applications, particularly due to its robust magnetic properties and topological features in the Kagomé lattice structure.