Topological Semimetal Transport Modulated by Interstitial Fe in Ba(Fe$_{1-x}$Co$_x$)$_{2+δ}As$_2$ Superconductors
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arXiv
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| Autori principali: | , , , , , , , , , , , , , , , , |
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| Natura: | Preprint |
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2026
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| _version_ | 1866912840965685248 |
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| author | Deng, Ze-Xian Cheng, Qiang-Jun Jiang, Jing Wang, Yong-Wei Zhou, Xi Ren, Ming-Qiang Lou, Cong Cong Chen, Xiao-Xiang Wu, Bin-Jie Zhu, Zeng-Wei Zhang, Qing-Hua Gu, Lin Zhang, Ding Liu, Kai Ma, Xu-Cun Xue, Qi-Kun Song, Can-Li |
| author_facet | Deng, Ze-Xian Cheng, Qiang-Jun Jiang, Jing Wang, Yong-Wei Zhou, Xi Ren, Ming-Qiang Lou, Cong Cong Chen, Xiao-Xiang Wu, Bin-Jie Zhu, Zeng-Wei Zhang, Qing-Hua Gu, Lin Zhang, Ding Liu, Kai Ma, Xu-Cun Xue, Qi-Kun Song, Can-Li |
| contents | Topological semimetals are renowned for exhibiting large, unsaturated magnetoresistance arising from ultrahigh carrier mobility and electron-hole compensation. However, such behaviors remain poorly understood in iron-based superconductors that have been recently recognized to harbor rich nontrivial topology. Here, we combine angle-resolved magneto-transport measurements with first principles calculations to reveal the emergence and tunability of topological semimetals in ferropnictide Ba(Fe$_{1-x}$Co$_x$)$_{2+δ}As$_2$ epitaxial films, modulated by interstitial Fe. These states exhibit ultralow residual resistivity, coexisting high-mobility electron and hole carriers, and linear positive magnetoresistance below 110 K. Remarkably, the magnetoresistance becomes more pronounced when the magnetic field is applied parallel to the film plane, reaching an unsaturated 1206% at 56 T. Furthermore, superconductivity persists in these ferropnictide films, establishing them as a tunable platform for investigating the interplay among electron correlation, topology, and superconductivity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_15875 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Topological Semimetal Transport Modulated by Interstitial Fe in Ba(Fe$_{1-x}$Co$_x$)$_{2+δ}As$_2$ Superconductors Deng, Ze-Xian Cheng, Qiang-Jun Jiang, Jing Wang, Yong-Wei Zhou, Xi Ren, Ming-Qiang Lou, Cong Cong Chen, Xiao-Xiang Wu, Bin-Jie Zhu, Zeng-Wei Zhang, Qing-Hua Gu, Lin Zhang, Ding Liu, Kai Ma, Xu-Cun Xue, Qi-Kun Song, Can-Li Superconductivity Materials Science Strongly Correlated Electrons Topological semimetals are renowned for exhibiting large, unsaturated magnetoresistance arising from ultrahigh carrier mobility and electron-hole compensation. However, such behaviors remain poorly understood in iron-based superconductors that have been recently recognized to harbor rich nontrivial topology. Here, we combine angle-resolved magneto-transport measurements with first principles calculations to reveal the emergence and tunability of topological semimetals in ferropnictide Ba(Fe$_{1-x}$Co$_x$)$_{2+δ}As$_2$ epitaxial films, modulated by interstitial Fe. These states exhibit ultralow residual resistivity, coexisting high-mobility electron and hole carriers, and linear positive magnetoresistance below 110 K. Remarkably, the magnetoresistance becomes more pronounced when the magnetic field is applied parallel to the film plane, reaching an unsaturated 1206% at 56 T. Furthermore, superconductivity persists in these ferropnictide films, establishing them as a tunable platform for investigating the interplay among electron correlation, topology, and superconductivity. |
| title | Topological Semimetal Transport Modulated by Interstitial Fe in Ba(Fe$_{1-x}$Co$_x$)$_{2+δ}As$_2$ Superconductors |
| topic | Superconductivity Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2601.15875 |