paper

Disorder driven crossover between anomalous Hall regimes in Fe $_{3}$ GaTe $_{2}$

arXiv:2507.23243 · doi:10.1103/PhysRevB.111.184438

Abstract

The large anomalous Hall conductivity (AHC) of the Fe $_{3}$ (Ge,Ga)Te $_{2}$ compounds has attracted considerable attention. Here, we expose the intrinsic nature of AHC in Fe $_{3}$ GaTe $_{2}$ crystals characterized by high conductivities, which show disorder-independent AHC with a pronounced value $I ¨ _{x y}^{c} \approx$ 420 $I^c ◯^{- 1}$ cm $^{- 1}$ . In the low conductivity regime, we observe the scaling relation $I ¨ _{x y} \propto I ¨ _{xx}^{1.6}$ , which crosses over to $I ¨ _{x y} ≃ I ¨ _{x y}^{c}$ as $I ¨ _{xx}$ increases. Disorder in low-conductivity crystals is confirmed by the broadening of a first-order transition between ferromagnetism and the ferrimagnetic ground state. Through density functional theory (DFT) calculations, we reveal that the dominant sources of Berry curvature are located a few hundred meV below the Fermi energy around the $I^$ -point. Therefore, Fe $_{3}$ GaTe $_{2}$ clearly exposes the disorder-induced crossover among distinct AHC regimes, previously inferred from measurements on different ferromagnets located in either side of the crossover region.

9 pages, 6 figures

Disorder driven crossover between anomalous Hall regimes in Fe3​GaTe2​

Abstract

Disorder driven crossover between anomalous Hall regimes in Fe $_{3}$ GaTe $_{2}$