Strong-coupling superconductivity in LiB2C2 trilayer films
Miao Gao, Xun-Wang Yan, Zhong-Yi Lu, Tao Xiang
DOI 10.1103/PhysRevB.101.094501 · Physical Review B
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Abstract
Coupling between σ-bonding electrons and phonons is generally very strong. To metallize σ electrons provides a promising route to hunt for new high-Tc 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-Tc superconductivity. By solving the anisotropic Eliashberg equations, we find that free-standing trilayer LiB2C2 is a phonon-mediated superconductor with Tc exceeding the liquid-nitrogen temperature at ambient pressure. The transition temperature can be further raised to 125 K by applying a biaxial tensile strain.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LiB2C2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92 | Pressure unresolved | unknown |
| LiB2C2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 125 | Pressure not reported | unknown |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39 | Pressure unresolved | unknown |
| Li3B4C2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 50 | Pressure not reported | unknown |
| Li2B3C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 50 | Pressure not reported | unknown |
| Li4B5C3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 16.8 | Pressure not reported | unknown |
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