DOE OSTI · 2574333
Disorder driven crossover between anomalous Hall regimes in Fe 3 GaTe 2
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 the AHC in Fe 3 GaTe 2 crystals characterized by high conductivities, which show disorder-independent AHC with a pronounced value 𝜎$^{c}_{𝑥𝑦}$≈ 420 Ω −1 cm −1 . In the low-conductivity regime, we observe the scaling relation 𝜎 𝑥𝑦 ∝ 𝜎$^{1.6}_{𝑥𝑥}$, which crosses over to 𝜎 𝑥𝑦 ≃ 𝜎$^{c}_{𝑥𝑦}$ as 𝜎 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 Γ point. Furthermore, Fe 3 GaTe 2 clearly exposes the disorder-induced crossover among distinct AHC regimes, previously inferred from measurements on different ferromagnets located on either side of the crossover region.
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Lee, Sang-Eon [National High Magnetic Field Laboratory, Tallahassee, FL (United States); Hanyang University, Seoul (Korea, Republic of)] (ORCID:0000000278276117), Park, Minkyu [Korea Research Institute of Standards and Science, Daejeon (Korea, Republic of)], Brown, W. Kice [Baylor University, Waco, TX (United States)] (ORCID:0000000170010448), Kulichenko, Vadym [National High Magnetic Field Laboratory, Tallahassee, FL (United States)] (ORCID:0000000184276167), Xin, Yan [National High Magnetic Field Laboratory, Tallahassee, FL (United States)] (ORCID:0000000192915061), Rhim, S. H. [University of Ulsan (Korea, Republic of)], Hwang, Chanyong [Korea Research Institute of Standards and Science, Daejeon (Korea, Republic of)] (ORCID:0000000266127552), Kim, Jaeyong [Hanyang University, Seoul (Korea, Republic of)], McCandless, Gregory T. [Baylor University, Waco, TX (United States)], Chan, Julia Y. [Baylor University, Waco, TX (United States)] (ORCID:0000000344342160), Balicas, Luis [National High Magnetic Field Laboratory, Tallahassee, FL (United States); Florida State University, Tallahassee, FL (United States)] (ORCID:0000000252090293). 2025-05-27. Disorder driven crossover between anomalous Hall regimes in Fe 3 GaTe 2. https://doi.org/10.1103/physrevb.111.184438
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