Role of U/W Ratio in Non-Fermi-Liquid Behavior of DO3-Fe3Ga

Determine how the ratio U/W between the electron-correlation strength U and the flat-band bandwidth W governs the emergence of non-Fermi-liquid behavior in the ferromagnetic topological semimetal DO3-Fe3Ga that hosts flattened Weyl points, and quantitatively characterize this relationship.

Background

The authors observe non-Fermi-liquid behavior at ultra-low temperatures in DO3-Fe3Ga, with a resistivity power-law exponent n ≈ 1.53. They argue that flattened Weyl cones and associated correlations are likely responsible and introduce an effective interaction parameter U.

They identify the need to understand how the correlation-to-bandwidth ratio U/W controls the onset of non-Fermi-liquid behavior in this flat-band-derived Weyl system, indicating this as a concrete direction for future work.

References

A more detailed investigation into how the quantitative ratio U/W—between the correlation strength and the flat-band bandwidth—governs the emergence of NFL behavior will be pursued in future work.

— Robust Flat Magnetoresistivity in D0$_3$-Fe$_3$Ga Driven by Chiral Anomaly  (2603.29138 - Wang et al., 31 Mar 2026) in Supplementary Information, Section S5 (The Kadowaki-Woods Scaling Plot), final paragraph