Low Temperature Physics: 35, 724 (2009); https://doi.org/10.1063/1.3224732 (11 pages)
Fizika Nizkikh Temperatur: Volume 35, Number 8-9 (August 2009), p. 919-931 ( to contents , go back )
Electron sound in metals
Yu.A. Avramenko, E.V. Bezuglyi, N.G. Burma, and V.D. Fil
B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
Received June 19, 2009
We investigate the electron sound — oscillations of the electron distribution function coupled with elastic deformation and propagating with the Fermi velocity. The amplitude-phase relations for the electron sound in Ga single crystals are experimentally studied. A model problem of electron sound excitation in a compensated metal with equivalent Fermi surfaces was solved for the sample of finite size with diffuse electron scattering on the interfaces. It was found that the amplitude of displacement of the receiving interface far exceeds (by two orders of magnitude) the intrinsic elastic amplitude of the electron sound wave, due to the effect of electronic pressure. It was established that the variations in the amplitude and phase of the electron sound waves under the superconducting transition are independent of the distance passed by a wave, i.e., they are related only to the behavior of the transformation coefficient.
PACS: 72.15.Nj Collective modes (e.g., in onedimensional conductors);
Key words: Fermi-liquid, zero sound, quasiwave, Wiener-Hopf method.