First-principles prediction of phonon-mediated superconductivity in XBC (X = Mg, Ca, Sr, Ba)

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, T c , of MgBC is 51 K. The strong attractive interaction between σ-bonding electrons and the B 1g phonon mode gives rise to a larger electron-phonon coupling constant (1.135) and hence high T c ; notably, higher than that of MgB 2 . The other compounds have a low superconducting critical temperature (4-17 K) due to the interaction between σ-bonding electrons and low energy phonons (E 2u modes). Due to their energetic and dynamic stability, we envisage that these compounds can be synthesized experimentally. The calculated superconducting critical temperature ( T c ) of MgBC is 51 K; notably, higher than that of MgB 2 .