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VOLUME 25 (1977) | ISSUE 8 | PAGE 381
Metal phonon-spectrum singularities determined by local geometry of the Fermi surface
The existence of singularities in the angular dependence of the speed s and of the absorption coefficient Γ of sound in metal is predicted. The singularities are due to zero-curvature lines (lines of parabolic points) on the Fermi surface. The parabolic points should lead, besides, to enhancement of the Migdal-Kohn singularities and to singularities in the angular dependence of the Pippard (geometric) oscillations of the sound absorption coefficient.