| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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High-Temperature Phonon-Mediated Superconductivity with $T_{\rm c}$ above 100 K in Monolayer Na(BC)$_{2}$ and K(BC)$_{2}$ |
| Wenxuan Chen, Zhengtao Liu, Zihao Huo, Guiyan Dong, Jialiang Cai, and Defang Duan* |
| Key Laboratory of Material Simulation Methods & Software of Ministry of Education, and State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China |
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| Cite this article: |
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Wenxuan Chen, Zhengtao Liu, Zihao Huo et al 2024 Chin. Phys. Lett. 41 117403 |
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Abstract Two-dimensional (2D) materials have demonstrated promising prospects owing to their distinctive electronic properties and exceptional mechanical properties. Among them, 2D superconductors with $T_{\rm c}$ above the boiling point of liquid nitrogen (77 K) will exhibit tremendous applicable value in the future. Here, we design two 2D superconductors Na(BC)$_{2}$ and K(BC)$_{2}$ with MgB$_{2}$-like structures, which are theoretically predicted to host $T_{\rm c}$ as high as 99 and 102 K, respectively. The origin of such high $T_{\rm c}$ is ascribed to the presence of both $\sigma$-bonding bands and van Hove singularity at the Fermi level. Furthermore, $T_{\rm c}$ of Na(BC)$_{2}$ is boosted up to 153 K with a biaxial strain of 5%, which sets a new record among 2D superconductors. The predictions of Na(BC)$_{2}$ and K(BC)$_{2}$ open the door to explore 2D high-temperature superconductors and provide a potential future for developing new applications in 2D materials.
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Received: 19 August 2024
Published: 14 November 2024
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| PACS: |
74.78.-w
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(Superconducting films and low-dimensional structures)
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74.25.-q
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(Properties of superconductors)
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74.10.+v
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(Occurrence, potential candidates)
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