High Pressure Superconducting transition in Dihydride BiH$_2$ with Bismuth Open-Channel Framework
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| Main Authors: | , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866912930632564736 |
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| author | Ma, Liang Yang, Xin Li, Mei Shan, Pengfei Liu, Ziyi Hou, Jun Jiang, Sheng Zhang, Lili Lin, Chuanlong Yang, Pengtao Wang, Bosen Sun, Jianping Ding, Yang Gou, Huiyang Guo, Haizhong Cheng, Jinguang |
| author_facet | Ma, Liang Yang, Xin Li, Mei Shan, Pengfei Liu, Ziyi Hou, Jun Jiang, Sheng Zhang, Lili Lin, Chuanlong Yang, Pengtao Wang, Bosen Sun, Jianping Ding, Yang Gou, Huiyang Guo, Haizhong Cheng, Jinguang |
| contents | Metal hydrides MHx with low hydrogen content are not expected to show high-Tc superconductivity owing to the low hydrogen-derived electronic density of states at Fermi level and the limited hydrogen contribution to electron-phonon coupling strength. In this work, we report on the successful synthesis of a novel bismuth dihydride superconductor, Cmcm-BiH$_2$, at approximately 150 GPa, and the discovery of superconductivity with Tc about 62 K at 163 GPa, marking the first instance of superconductor among the MH$_2$-type metal dihydrides. Cmcm-BiH$_2$ adopts a unique host-guest type structure, in which the Bi atoms via weak Bi-Bi covalent bonds form a three-dimensional open-channel framework that encapsulates H$_2$-like molecules as guests, thereby broadening the structural diversity of hydrides under high pressures. The occurrence of superconductivity is evidenced by a sharp drop of resistivity to zero and the characteristic downward shift of Tc under applied magnetic fields. Notably, Cmcm-BiH$_2$ remains stable down to at least 97 GPa during decompression, with the calculated lowest pressure for dynamic stability of 10 GPa. In-depth analysis reveals that the covalent bismuth open-channel structure forms metallic conduction channels, dominates the electronic states near the Fermi level, and contributes approximately 51% of the total $lambda$ in Cmcm-BiH$_2$, distinguishing it from known high-pressure hydride superconductors. These findings highlight the critical role of non-hydrogen elements in producing superconductivity and open new avenues for the design and optimization of high-Tc hydride superconductors. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2510_21338 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | High Pressure Superconducting transition in Dihydride BiH$_2$ with Bismuth Open-Channel Framework Ma, Liang Yang, Xin Li, Mei Shan, Pengfei Liu, Ziyi Hou, Jun Jiang, Sheng Zhang, Lili Lin, Chuanlong Yang, Pengtao Wang, Bosen Sun, Jianping Ding, Yang Gou, Huiyang Guo, Haizhong Cheng, Jinguang Superconductivity Metal hydrides MHx with low hydrogen content are not expected to show high-Tc superconductivity owing to the low hydrogen-derived electronic density of states at Fermi level and the limited hydrogen contribution to electron-phonon coupling strength. In this work, we report on the successful synthesis of a novel bismuth dihydride superconductor, Cmcm-BiH$_2$, at approximately 150 GPa, and the discovery of superconductivity with Tc about 62 K at 163 GPa, marking the first instance of superconductor among the MH$_2$-type metal dihydrides. Cmcm-BiH$_2$ adopts a unique host-guest type structure, in which the Bi atoms via weak Bi-Bi covalent bonds form a three-dimensional open-channel framework that encapsulates H$_2$-like molecules as guests, thereby broadening the structural diversity of hydrides under high pressures. The occurrence of superconductivity is evidenced by a sharp drop of resistivity to zero and the characteristic downward shift of Tc under applied magnetic fields. Notably, Cmcm-BiH$_2$ remains stable down to at least 97 GPa during decompression, with the calculated lowest pressure for dynamic stability of 10 GPa. In-depth analysis reveals that the covalent bismuth open-channel structure forms metallic conduction channels, dominates the electronic states near the Fermi level, and contributes approximately 51% of the total $lambda$ in Cmcm-BiH$_2$, distinguishing it from known high-pressure hydride superconductors. These findings highlight the critical role of non-hydrogen elements in producing superconductivity and open new avenues for the design and optimization of high-Tc hydride superconductors. |
| title | High Pressure Superconducting transition in Dihydride BiH$_2$ with Bismuth Open-Channel Framework |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2510.21338 |