Superconductivity and Lattice Instability in Compressed Lithium from Fermi Surface Hot Spots

Details Superconductivity and Lattice Instability in Compressed Lithium from Fermi Surface Hot Spots Superconductivity and Lattice Instability in Compressed Lithium from Fermi Surface Hot Spots

2005-10-20

arxiv.org/abs/cond-mat/0510558v1

Physics

Condensed Matter

Superconductivity

4 pages, 3 embedded figures

Scientific paper

10.1103/PhysRevLett.96.047004

The highest superconducting temperature T$_c$ observed in any elemental metal (Li with T$_c$ ~ 20 K at pressure P ~ 40 GPa) is shown to arise from critical (formally divergent) electron-phonon coupling to the transverse T$_1$ phonon branch along intersections of Kohn anomaly surfaces with the Fermi surface. First principles linear response calculations of the phonon spectrum and spectral function $\alpha^2 F(\omega)$ reveal (harmonic) instability already at 25 GPa. Our results imply that the fcc phase is anharmonically stabilized in the 25-38 GPa range.

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