Origin of Strong Coupling in Lithium under Pressure

Abstract

In an attempt to provide a clearer understanding of the impressive increase in T_c under pressure in elemental Li, linear response calculation of the phonon dispersion curves, electron-phonon matrix elements, phonon linewidths and mode lambda's have been carried out on a finer mesh (24^3 in the Brillouin zone) than done previously, for the volume corresponding to 20 GPa pressure. The result illustrates the great need for a fine mesh (even finer than this) for converged results of lambda and the spectral function alpha^2 F. Although the initial pressure-induced transverse T_1 phonon instability (in harmonic approximation) near the symmetry point K has dominated attention, the current results show that the high value of T_c gets strong contributions from elsewhere in the zone, particularly from the longitudinal mode along (100).

Proceedings for M2S

References in corpus (6)

• Linear-response theory and lattice dynamics: a muffin-tin orbital approach
• Electron-phonon interactions and related physical properties of metals from linear-response theory
• Superconducting phase diagram of Li Metal in nearly hydrostatic pressures up to 67 GPa
• Superconductivity in lithium, potassium and aluminium under extreme pressure: A first-principles study
• Superconductivity and Lattice Instability in Compressed Lithium from Fermi Surface Hot Spots
• Superconductivity at 17 K in Yttrium Metal under Nearly Hydrostatic Pressures to 89 GPa

Cited by in corpus (4)

• Cubic H${}_3$S around 200 GPa: an atomic hydrogen superconductor stabilized by sulfur
• Development of Density-Functional Theory for Plasmon-Assisted Superconducting State: Application to Lithium Under High Pressures
• Density Functional Theory for Plasmon-Assisted Superconductivity
• Competing Phases, Strong Electron-Phonon Interaction and Superconductivity in Elemental Calcium under High Pressure