Pressure dependence of the electron-phonon interaction and Fermi-surface properties of Al, Au, bcc Li, Pb, and Pd

The electrical resistance of Li, Pd, Au, and Pb is measured as a function of temperature and pressure in the region -20 ^∘{}C to +30 ^∘{}C and 0--1.3 GPa. Self-consistent linear muffin-tin orbital band-structure calculations of these elements and of Al are performed at normal and reduced volumes. Results are obtained for the density of states N(EF), the average Fermi ve- locity, the optical mass, the plasma frequency {ω}, and the volume dependence of these parameters. The pressure dependence of the electron-phonon interaction {λ}(p) is obtained from these measurements and the calculated {ω}(p). For the superconducting elements there is good agreement with the measured superconducting Tc(p). Results from our previous measurements and calculations on Al, V, Nb, and La and published results for {ω}(p) are included in this comparison. {λ}(p) increases with pressure for bcc Li and decreases for Pd and Au. Pressure is expected to suppress spin fluctuations much faster than {λ}(p) in Pd. The possibility of inducing superconductivity by pressure in Pd and bcc Li is discussed. The electronic Gr\"uneisen parameter γₑ is obtained from {λ}(p) and the volume dependence of N(EF). Comparison with other results for γₑ generally shows good agreement.