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High superconducting critical temperature (   T c ) of 73.6 K at ambient pressure is predicted in BSiC 2  by means of the first-principles electron–phonon calculations. Without the need for doping or pressurization, the stoichiometric BSiC 2  exhibits strong electron–phonon coupling (EPC) and highest    T c among BCS-superconductors at ambient pressure. Also, it is hydrogen-free that makes easier the sample growth. The dramatic softening of the    E 2 g mode is the main account for the strong EPC. In addition, we find that BC 3 , derived from the replacement of Si in BSiC 2  by another C, is also superconducting with a high    T c ∼ 40 K. Our work indicates that these materials form a new family of high-   T c BCS-superconductors at ambient pressure.

Ambient-pressure high-temperature superconductivity in stoichiometric hydrogen-free covalent compound BSiC2

Ambient-pressure high-temperature superconductivity in stoichiometric hydrogen-free covalent compound BSiC₂