  Boron carbon compounds have been shown to have feasible superconductivity. In
our earlier paper [Zheng et al., Phys. Rev. B 107, 014508 (2023)], we
identified a new conventional superconductor of LiB3C at 100 GPa. Here, we aim
to extend the investigation of possible superconductivity in this structural
framework by replacing Li atoms with 27 different cations under pressures
ranging from 0 to 100 GPa. Using the high-throughput screening method of
zone-center electron-phonon interaction, we find that ternary compounds like
CaB3C, SrB3C, TiB3C, and VB3C are promising candidates for superconductivity.
The consecutive calculations using the full Brillouin zone confirm that they
have Tc < 31 K at moderate pressures. Our study demonstrates that fast
screening of superconductivity by calculating zone-center electron-phonon
coupling strength is an effective strategy for high-throughput identification
of new superconductors.
