Superconductivity and Lattice Instability in Compressed Lithium from Fermi Surface Hot Spots
Deepa Kasinathan, J. Kuneš, A. Lazicki, H. Rosner, C. S. Yoo, R. T. Scalettar, W. E. Pickett
DOI 10.1103/PhysRevLett.96.047004 · Physical Review Letters
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Abstract
The highest superconducting temperature Tc observed in any elemental metal (Li with Tc∼18–20 K at pressure 35–48 GPa) is shown to arise from increasingly strong electron-phonon coupling concentrated along intersections of Kohn anomaly surfaces with the evolving Fermi surface. First-principles linear response calculations of the phonon spectrum and spectral function α2F(ω) reveal very strong Q- and phonon-polarization dependence of coupling strength, resulting in values of Tc in the observed range. The sharp momentum dependence of the coupling even for the simple Li Fermi surface indicates more generally that a fine Q mesh is required for precise evaluation of λ.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Li Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 14 | 20 GPa | unknown |
| Li Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20 | 50 GPa | unknown |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 40 | Pressure not reported | unknown |
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