Reviews of topical problems

On nonadiabatic effects in phonon spectra of metals

 a,  b
a Lebedev Physical Institute, Russian Academy of Sciences, Leninsky prosp. 53, Moscow, 119991, Russian Federation
b Vereshchagin Institute for High Pressure Physics, Russian Academy of Sciences, Kaluzhskoe shosse 14, Troitsk, Moscow, 108840, Russian Federation

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 q satisfying the condition qvF < ω0(q), where vF is the electron Fermi velocity, and ω0(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.

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Fulltext is also available at DOI: 10.1070/PU2008v051n06ABEH006462
PACS: 71.15.Mb, 74.20.−z, 74.72.−h (all)
DOI: 10.1070/PU2008v051n06ABEH006462
Citation: Maksimov E G, Karakozov A E "On nonadiabatic effects in phonon spectra of metals" Phys. Usp. 51 535–549 (2008)
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Оригинал: Максимов Е Г, Каракозов А Е «О неадиабатических эффектах в фононных спектрах металлов» УФН 178 561–576 (2008); DOI: 10.3367/UFNr.0178.200806a.0561

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