Large ferromagnetic-like band splitting in ultrathin ${\mathrm{SmC}}_{6}$ films
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arXiv
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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866908450667102208 |
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| author | Zheng, Hao Xu, Yifu Yang, Guowei Pan, Ze Wu, Yi Zheng, Yuan Sun, Tulai Cao, Jiefeng Yang, Yi-feng Shi, Ming Cao, Chao Liu, Yang |
| author_facet | Zheng, Hao Xu, Yifu Yang, Guowei Pan, Ze Wu, Yi Zheng, Yuan Sun, Tulai Cao, Jiefeng Yang, Yi-feng Shi, Ming Cao, Chao Liu, Yang |
| contents | Two-dimensional (2D) magnetic materials provide a unique platform for exploring quantum phases from magnetic order in reduced dimensions. While there have been extensive studies on 2D magnetic materials based on 3$d$ electrons, experimental studies on 4$f$-electron counterparts are far fewer, particularly on their electronic structure. In this study, we report the successful synthesis of ultrathin ${\mathrm{SmC}}_{6}$ films using molecular beam epitaxy. Utilizing in situ angle-resolved photoemission spectroscopy (ARPES), we uncover a large band splitting in the valence bands, which we attribute to the ferromagnetic order driven by exchange couplings between Sm 4$f$ moments and conduction electrons. Despite the small magnetic moment of Sm, the observed splitting is comparable to those of Eu- and Gd-based systems with much larger local moments. Interestingly, the surface state also exhibits splitting with similar magnitude and can be eliminated by overannealing, while the valence bands with ferromagnetic-like splittings remain robust. Our work provides spectroscopic insight to understand the electronic origin of magnetic order in Sm-based compounds. Our study also offers a platform to study 2D magnetic materials based on 4$f$ electrons. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2507_11396 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Large ferromagnetic-like band splitting in ultrathin ${\mathrm{SmC}}_{6}$ films Zheng, Hao Xu, Yifu Yang, Guowei Pan, Ze Wu, Yi Zheng, Yuan Sun, Tulai Cao, Jiefeng Yang, Yi-feng Shi, Ming Cao, Chao Liu, Yang Strongly Correlated Electrons Materials Science Two-dimensional (2D) magnetic materials provide a unique platform for exploring quantum phases from magnetic order in reduced dimensions. While there have been extensive studies on 2D magnetic materials based on 3$d$ electrons, experimental studies on 4$f$-electron counterparts are far fewer, particularly on their electronic structure. In this study, we report the successful synthesis of ultrathin ${\mathrm{SmC}}_{6}$ films using molecular beam epitaxy. Utilizing in situ angle-resolved photoemission spectroscopy (ARPES), we uncover a large band splitting in the valence bands, which we attribute to the ferromagnetic order driven by exchange couplings between Sm 4$f$ moments and conduction electrons. Despite the small magnetic moment of Sm, the observed splitting is comparable to those of Eu- and Gd-based systems with much larger local moments. Interestingly, the surface state also exhibits splitting with similar magnitude and can be eliminated by overannealing, while the valence bands with ferromagnetic-like splittings remain robust. Our work provides spectroscopic insight to understand the electronic origin of magnetic order in Sm-based compounds. Our study also offers a platform to study 2D magnetic materials based on 4$f$ electrons. |
| title | Large ferromagnetic-like band splitting in ultrathin ${\mathrm{SmC}}_{6}$ films |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2507.11396 |