| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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High-Temperature Superconductivity in Doped Boron Clathrates |
| Liang Ma1,2,3, Lingrui Wang1, Yifang Yuan1*, Haizhong Guo1,2*, and Hongbo Wang4 |
1Key Laboratory of Materials Physics (Ministry of Education), School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450052, China
2Institute of Quantum Materials and Physics, Henan Academy of Sciences, Zhengzhou 450046, China
3Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
4State Key Laboratory of Superhard Materials & International Center for Computational Method and Software, College of Physics, Jilin University, Changchun 130012, China
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| Cite this article: |
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Liang Ma, Lingrui Wang, Yifang Yuan et al 2023 Chin. Phys. Lett. 40 086201 |
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Abstract The recent discoveries of near-room-temperature superconductivity in clathrate hydrides present compelling evidence for the reliability of theory-orientated conventional superconductivity. Nevertheless, the harsh pressure conditions required to maintain such high $T_{\rm c}$ limit their practical applications. To address this challenge, we conducted extensive first-principles calculations to investigate the doping effect of the recently synthesized LaB$_{8}$ clathrate, intending to design high-temperature superconductors at ambient pressure. Our results demonstrate that these clathrates are highly promising for high-temperature superconductivity owing to the coexistence of rigid boron covalent networks and the tunable density of states at the Fermi level. Remarkably, the predicted $T_{\rm c}$ of BaB$_{8}$ could reach 62 K at ambient pressure, suggesting a significant improvement over the calculated $T_{\rm c}$ of 14 K in LaB$_{8}$. Moreover, further calculations of the formation enthalpies suggest that BaB$_{8}$ could be potentially synthesized under high-temperature and high-pressure conditions. These findings highlight the potential of doped boron clathrates as promising superconductors and provide valuable insights into the design of light-element clathrate superconductors.
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Received: 27 April 2023
Published: 14 July 2023
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| PACS: |
62.50.-p
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(High-pressure effects in solids and liquids)
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74.70.-b
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(Superconducting materials other than cuprates)
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74.62.Fj
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(Effects of pressure)
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61.50.Ah
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(Theory of crystal structure, crystal symmetry; calculations and modeling)
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