From first-principles calculations, we predict four new intercalated hexagonal XBC (X=Mg, Ca, Sr, Ba) compounds to be dynamically stable and phonon-mediated superconductors. These compounds form a LiBC like structure but are metallic. The calculated superconducting critical temperature, Tc, of MgBC is 51 K. The strong attractive interaction between σ-bonding electrons and the B1g phonon mode gives rise to a larger electron-phonon coupling constant (1.135) and hence high Tc; notably, higher than that of MgB2. The other compounds have a low superconducting critical temperature (4-17 K) due to the interaction between σ-bonding electrons and low energy phonons (E2u modes). Due to their energetic and dynamic stability, we envisage that these compounds can be synthesized experimentally.
@article{arxiv.1808.06700,
title = {First-principles prediction of phonon-mediated superconductivity in XBC (X= Mg, Ca, Sr, Ba)},
author = {Enamul Haque and M. Anwar Hossain and Catherine Stampfl},
journal= {arXiv preprint arXiv:1808.06700},
year = {2022}
}