Disorder driven crossover between anomalous Hall regimes in Fe$_3$GaTe$_2$
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arXiv
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| Auteurs principaux: | , , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866915418647560192 |
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| author | Lee, Sang-Eon Park, Minkyu Brown, W. Kice Kulichenko, Vadym Xin, Yan Rhim, S. H. Hwang, Chanyong Kim, Jaeyong McCandless, Gregory T. Chan, Julia Y. Balicas, Luis |
| author_facet | Lee, Sang-Eon Park, Minkyu Brown, W. Kice Kulichenko, Vadym Xin, Yan Rhim, S. H. Hwang, Chanyong Kim, Jaeyong McCandless, Gregory T. Chan, Julia Y. Balicas, Luis |
| contents | 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 $σ_{xy}^{\text{c}}\approx$ 420 $Ω^{-1}$cm$^{-1}$. In the low conductivity regime, we observe the scaling relation $σ_{xy}\proptoσ_{xx}^{1.6}$, which crosses over to $σ_{xy} \simeq σ_{xy}^{\text{c}}$ 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. 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_23243 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Disorder driven crossover between anomalous Hall regimes in Fe$_3$GaTe$_2$ Lee, Sang-Eon Park, Minkyu Brown, W. Kice Kulichenko, Vadym Xin, Yan Rhim, S. H. Hwang, Chanyong Kim, Jaeyong McCandless, Gregory T. Chan, Julia Y. Balicas, Luis Materials Science 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 $σ_{xy}^{\text{c}}\approx$ 420 $Ω^{-1}$cm$^{-1}$. In the low conductivity regime, we observe the scaling relation $σ_{xy}\proptoσ_{xx}^{1.6}$, which crosses over to $σ_{xy} \simeq σ_{xy}^{\text{c}}$ 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. 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. |
| title | Disorder driven crossover between anomalous Hall regimes in Fe$_3$GaTe$_2$ |
| topic | Materials Science |
| url | https://arxiv.org/abs/2507.23243 |