High temperature surface state in Kondo insulator U$_3$Bi$_4$Ni$_3$
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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_ | 1866909546809655296 |
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| author | Broyles, Christopher Wan, Xiaohan Cheng, Wenting Wu, Dingsong Tan, Hengxin Xu, Qiaozhi Gould, Shannon L. Siddiquee, Hasan Xiao, Leyan Chen, Ryan Lin, Wanyue Wu, Yuchen Regmi, Prakash Eo, Yun Suk Liu, Jieyi Chen, Yulin Yan, Binghai Sun, Kai Ran, Sheng |
| author_facet | Broyles, Christopher Wan, Xiaohan Cheng, Wenting Wu, Dingsong Tan, Hengxin Xu, Qiaozhi Gould, Shannon L. Siddiquee, Hasan Xiao, Leyan Chen, Ryan Lin, Wanyue Wu, Yuchen Regmi, Prakash Eo, Yun Suk Liu, Jieyi Chen, Yulin Yan, Binghai Sun, Kai Ran, Sheng |
| contents | The resurgence of interest in Kondo insulators has been driven by two major mysteries: the presence of metallic surface states and the observation of quantum oscillations. To further explore these mysteries, it is crucial to investigate another similar system beyond the two existing ones, SmB$_6$ and YbB$_{12}$. Here, we address this by reporting on a Kondo insulator, U$_3$Bi$_4$Ni$_3$. Our transport measurements reveal that a surface state emerges below 250 K and dominates transport properties below 150 K, which is well above the temperature scale of SmB$_6$ and YbB$_{12}$. At low temperatures, the surface conductivity is about one order of magnitude higher than the bulk. The robustness of the surface state indicates that it is inherently protected. The similarities and differences between U$_3$Bi$_4$Ni$_3$ and the other two Kondo insulators will provide valuable insights into the nature of metallic surface states in Kondo insulators and their interplay with strong electron correlations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_03448 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | High temperature surface state in Kondo insulator U$_3$Bi$_4$Ni$_3$ Broyles, Christopher Wan, Xiaohan Cheng, Wenting Wu, Dingsong Tan, Hengxin Xu, Qiaozhi Gould, Shannon L. Siddiquee, Hasan Xiao, Leyan Chen, Ryan Lin, Wanyue Wu, Yuchen Regmi, Prakash Eo, Yun Suk Liu, Jieyi Chen, Yulin Yan, Binghai Sun, Kai Ran, Sheng Strongly Correlated Electrons The resurgence of interest in Kondo insulators has been driven by two major mysteries: the presence of metallic surface states and the observation of quantum oscillations. To further explore these mysteries, it is crucial to investigate another similar system beyond the two existing ones, SmB$_6$ and YbB$_{12}$. Here, we address this by reporting on a Kondo insulator, U$_3$Bi$_4$Ni$_3$. Our transport measurements reveal that a surface state emerges below 250 K and dominates transport properties below 150 K, which is well above the temperature scale of SmB$_6$ and YbB$_{12}$. At low temperatures, the surface conductivity is about one order of magnitude higher than the bulk. The robustness of the surface state indicates that it is inherently protected. The similarities and differences between U$_3$Bi$_4$Ni$_3$ and the other two Kondo insulators will provide valuable insights into the nature of metallic surface states in Kondo insulators and their interplay with strong electron correlations. |
| title | High temperature surface state in Kondo insulator U$_3$Bi$_4$Ni$_3$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2502.03448 |