This article is cited in 16 papers

REVIEWS OF TOPICAL PROBLEMS

On nonadiabatic effects in phonon spectra of metals

E. G. Maksimov^a, A. E. Karakozov<sup>b

a</sup> P. N. Lebedev Physical Institute, Russian Academy of Sciences
^b L. F. Vereshchagin Institute for High Pressure Physics, Russian Academy of Sciences

Abstract: Experimental and theoretical research on nonadiabatic effects in metals is briefly reviewed. It is shown that these effects are most manifest in optical phonon spectra at small wave vectors $\mathbf{q}$ satisfying the condition $\mathbf{qv}_F<\omega_0(\mathbf{q})$, where $\mathbf{v}_F$ is the electron Fermi velocity, and $\omega_0(\mathbf{q})$ is the phonon frequency. Various theoretical approaches to calculating nonadiabatic effects are examined. Fröhlich's phenomenological field-theoretical model, the most widely used in such calculations, is discussed in detail, some aspects of its application are considered, and its efficiency as a tool for studying nonadiabatic effects is demonstrated.

PACS: 71.15.Mb, 74.20.-z, 74.72.-h

Received: September 7, 2007
Revised: October 14, 2007

DOI: 10.3367/UFNr.0178.200806a.0561

 English version: Physics–Uspekhi, 2008, 51:6, 535–549

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