Abstract
Multigap superconductors provide a platform to confirm rich new physics such as time-reversal symmetry breaking, giant paramagnetic response, and hidden criticality. However, an obstacle hindering the experimental validation of these phenomena lies in the lack of superconductors with three or more gaps and critical temperatures higher than the liquid nitrogen temperature. In this work, we predicted NaB2C2 and Na2B3C3 films with high-temperature superconductivity (beyond 90 K) using the fully anisotropic Migdal-Eliashberg theory. The multigap behaviors of Na–B–C films with three and five atomic layers were analyzed in detail, revealing two typical configurations: three-gap (NaB2C2) and four-gap (Na2B3C3) superconductors. Compared with the NaB2C2 film, the additional gap observed in the Na2B3C3 film originates from the in-plane covalent state of the internal B–C layer. This research offers valuable insights into the evolution of multigap superconductivity in layered B–C films.
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