Strong-coupling superconductivity in LiB2C2 trilayer films

Article

关键词: ELECTRONIC-STRUCTURE;    CRYSTAL-STRUCTURE;    TEMPERATURE;    DISPERSION;    GRAPHITE;    LIBC;    MGB2;   

DOI  :  10.1103/PhysRevB.101.094501

来源: SCIE

【 摘 要 】

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 LiB2C2 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 LiB2C2 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.

【 授权许可】

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