Tunable Giant Anomalous Hall in a Kondo Lattice Ferromagnet UBiTe

TL;DR

This study reveals that in the ferromagnetic Kondo lattice UBiTe, the anomalous Hall effect is strongly influenced by Kondo coherence and Fermi level shifts, highlighting unique topological electronic properties.

Contribution

It demonstrates the tunability of the giant anomalous Hall effect in UBiTe through Fermi level shifts and Kondo coherence, revealing new insights into topological phenomena in Kondo lattices.

Findings

Intrinsic anomalous Hall conductivity is linked to Kondo coherence temperature.

Small Fermi level shifts cause significant changes in Hall conductivity.

One sample exhibits among the highest anomalous Hall conductivities in topological magnetic materials.

Abstract

Kondo lattice systems are recognized for potentially hosting a variety of rich topological phases. Several pioneering studies have demonstrated significant anomalous Hall and anomalous Nernst effects in these systems, attributed to the Berry curvature of the hybridization bands. In this study, we investigate UBiTe, a ferromagnetic Kondo lattice system. Our findings reveal that the intrinsic contribution to the anomalous Hall conductivity is closely tied to the Kondo coherence temperature. Moreover, we demonstrate that slight shifts in the Fermi level across three different samples significantly influence this intrinsic contribution, in alignment with the Berry curvature localized within the narrow hybridization bands. This provides a stark contrast to the less pronounced sensitivity observed in weakly correlated Weyl semimetals, underscoring the distinctive electronic properties of Kondo lattice systems. The anomalous Hall conductivity of one samples ranks among the highest reported for topological magnetic materials.