Breakdown of the scaling relation of anomalous Hall effect in Kondo lattice ferromagnet USbTe

TL;DR

This study reveals that in the Kondo lattice ferromagnet USbTe, the anomalous Hall effect driven by Berry curvature does not follow traditional Fermi liquid scaling, highlighting the influence of Kondo hybridization and flat bands.

Contribution

It demonstrates the breakdown of Fermi liquid scaling in the anomalous Hall effect due to Kondo-induced flat bands and Berry curvature interactions.

Findings

Large intrinsic Berry curvature dominates at low temperatures.

Anomalous Hall effect does not follow Fermi liquid scaling.

Berry curvature is linked to Kondo hybridization and flat bands.

Abstract

The interaction between strong correlation and Berry curvature is an open territory of in the field of quantum materials. Here we report large anomalous Hall conductivity in a Kondo lattice ferromagnet USbTe which is dominated by intrinsic Berry curvature at low temperatures. However, the Berry curvature induced anomalous Hall effect does not follow the scaling relation derived from Fermi liquid theory. The onset of the Berry curvature contribution coincides with the Kondo coherent temperature. Combined with ARPES measurement and DMFT calculations, this strongly indicates that Berry curvature is hosted by the flat bands induced by Kondo hybridization at the Fermi level. Our results demonstrate that the Kondo coherence of the flat bands has a dramatic influence on the low temperature physical properties associated with the Berry curvature, calling for new theories of scaling relations of anomalous Hall effect to account for the interaction between strong correlation and Berry curvature.