Strong coupling superconductivity in trilayer film LiB${}_2$C${}_2$

Abstract

Coupling between $\sigma$-bonding electrons and phonons is generally very strong. To metallize $\sigma$-electrons provides a promising route to hunt for new high-T${}_c$ superconductors. Based on this picture and first-principles density functional calculation with Wannier interpolation for electronic structure and lattice dynamics, we predict that trilayer film LiB${}_2$C${}_2$ is a good candidate to realize this kind of high-T${}_c$ superconductivity. By solving the anisotropic Eliashberg equations, we find that free-standing trilayer LiB${}_2$C${}_2$ is a phonon-mediated superconductor with T${}_c$ exceeding the liquid-nitrogen temperature at ambient pressure. The transition temperature can be further raised to 125 K by applying a biaxial tensile strain.

arXiv comment5 pages, 6 figures

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