Spectral Evidence for Local-Moment Ferromagnetism in van der Waals Metals Fe$_3$GaTe$_2$ and Fe$_3$GeTe$_2$
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| Format: | Preprint |
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2023
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| _version_ | 1866911805013491712 |
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| author | Wu, Han Hu, Chaowei Xie, Yaofeng Jang, Bo Gyu Huang, Jianwei Guo, Yucheng Wu, Shan Hu, Cheng Yue, Ziqin Shi, Yue Ren, Zheng Yilmaz, T. Vescovo, Elio Jozwiak, Chris Bostwick, Aaron Rotenberg, Eli Fedorov, Alexei Denlinger, Jonathan Klewe, Christoph Shafer, Padraic Lu, Donghui Hashimoto, Makoto Kono, Junichiro Birgeneau, Robert J. Xu, Xiaodong Zhu, Jian-Xin Dai, Pengcheng Chu, Jiun-Haw Yi, Ming |
| author_facet | Wu, Han Hu, Chaowei Xie, Yaofeng Jang, Bo Gyu Huang, Jianwei Guo, Yucheng Wu, Shan Hu, Cheng Yue, Ziqin Shi, Yue Ren, Zheng Yilmaz, T. Vescovo, Elio Jozwiak, Chris Bostwick, Aaron Rotenberg, Eli Fedorov, Alexei Denlinger, Jonathan Klewe, Christoph Shafer, Padraic Lu, Donghui Hashimoto, Makoto Kono, Junichiro Birgeneau, Robert J. Xu, Xiaodong Zhu, Jian-Xin Dai, Pengcheng Chu, Jiun-Haw Yi, Ming |
| contents | Magnetism in two-dimensional (2D) materials has attracted considerable attention recently for both fundamental understanding of magnetism and their tunability towards device applications. The isostructural Fe$_3$GeTe$_2$ and Fe$_3$GaTe$_2$ are two members of the Fe-based van der Waals (vdW) ferromagnet family, but exhibit very different Curie temperatures (T$_C$) of 210 K and 360 K, respectively. Here, by using angle-resolved photoemission spectroscopy and density functional theory, we systematically compare the electronic structures of the two compounds. Qualitative similarities in the Fermi surface can be found between the two compounds, with expanded hole pockets in Fe$_3$GaTe$_2$ suggesting additional hole carriers compared to Fe$_3$GeTe$_2$. Interestingly, we observe no band shift in Fe$_3$GaTe$_2$ across its T$_C$ of 360 K, compared to a small shift in Fe$_3$GeTe$_2$ across its T$_C$ of 210 K. The weak temperature-dependent evolution strongly deviates from the expectations of an itinerant Stoner mechanism. Our results suggest that itinerant electrons have minimal contributions to the enhancement of T$_C$ in Fe$_3$GaTe$_2$ compared to Fe$_3$GeTe$_2$, and that the nature of ferromagnetism in these Fe-based vdW ferromagnets must be understood with considerations of the electron correlations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2307_00441 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Spectral Evidence for Local-Moment Ferromagnetism in van der Waals Metals Fe$_3$GaTe$_2$ and Fe$_3$GeTe$_2$ Wu, Han Hu, Chaowei Xie, Yaofeng Jang, Bo Gyu Huang, Jianwei Guo, Yucheng Wu, Shan Hu, Cheng Yue, Ziqin Shi, Yue Ren, Zheng Yilmaz, T. Vescovo, Elio Jozwiak, Chris Bostwick, Aaron Rotenberg, Eli Fedorov, Alexei Denlinger, Jonathan Klewe, Christoph Shafer, Padraic Lu, Donghui Hashimoto, Makoto Kono, Junichiro Birgeneau, Robert J. Xu, Xiaodong Zhu, Jian-Xin Dai, Pengcheng Chu, Jiun-Haw Yi, Ming Strongly Correlated Electrons Magnetism in two-dimensional (2D) materials has attracted considerable attention recently for both fundamental understanding of magnetism and their tunability towards device applications. The isostructural Fe$_3$GeTe$_2$ and Fe$_3$GaTe$_2$ are two members of the Fe-based van der Waals (vdW) ferromagnet family, but exhibit very different Curie temperatures (T$_C$) of 210 K and 360 K, respectively. Here, by using angle-resolved photoemission spectroscopy and density functional theory, we systematically compare the electronic structures of the two compounds. Qualitative similarities in the Fermi surface can be found between the two compounds, with expanded hole pockets in Fe$_3$GaTe$_2$ suggesting additional hole carriers compared to Fe$_3$GeTe$_2$. Interestingly, we observe no band shift in Fe$_3$GaTe$_2$ across its T$_C$ of 360 K, compared to a small shift in Fe$_3$GeTe$_2$ across its T$_C$ of 210 K. The weak temperature-dependent evolution strongly deviates from the expectations of an itinerant Stoner mechanism. Our results suggest that itinerant electrons have minimal contributions to the enhancement of T$_C$ in Fe$_3$GaTe$_2$ compared to Fe$_3$GeTe$_2$, and that the nature of ferromagnetism in these Fe-based vdW ferromagnets must be understood with considerations of the electron correlations. |
| title | Spectral Evidence for Local-Moment Ferromagnetism in van der Waals Metals Fe$_3$GaTe$_2$ and Fe$_3$GeTe$_2$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2307.00441 |