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arXiv · 2503.07042

Prediction of high-temperature ambient-pressure superconductivity in hexagonal boron-rich clathrates

Bin Li·Yuxiang Fan·Chuanhui Yin·Junjie Zhai·Cong Zhu·Zhisi Cao·Jie Cheng·Shengli Liu
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Abstract

Inspired by recent predictions of superconductivity in B-C framework clathrates, we employ density functional theory to explore potential superconductors among hexagonal hydride-substituted compounds with compositions XB$_8$C, XB$_7$C$_2$, XB$_6$C$_3$, XB$_3$C$_6$, XB$_2$C$_7$, and XBC$_8$. Our high-throughput calculations on 96 compounds reveal several dynamically stable candidates exhibiting superconductivity at ambient pressure. Analysis of electronic structures and electron-phonon coupling demonstrates that CaB$_8$C, SrB$_8$C, and BaB$_8$C possess superconducting transition temperatures ($T_c$) exceeding 50 K, with CaB$_8$C exhibiting the highest predicted $T_c$ of 77.1 K among all stable compounds studied. These findings expand the family of B-C clathrate superconductors and provide valuable insights for experimental efforts aimed at discovering novel superconducting materials.

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Bin Li, Yuxiang Fan, Chuanhui Yin, Junjie Zhai, Cong Zhu, Zhisi Cao, Jie Cheng, Shengli Liu. 2025-03-10. Prediction of high-temperature ambient-pressure superconductivity in hexagonal boron-rich clathrates. https://doi.org/10.1103/physrevb.111.014510

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