On nonadiabatic effects in phonon spectra of metals

E.G. Maksimov^a, A.E. Karakozov^b
^aLebedev Physical Institute, Russian Academy of Sciences, Leninsky prosp. 53, Moscow, 119991, Russian Federation
^bVereshchagin 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 qv_F < ω₀(q), where v_F 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.

PACS: 71.15.Mb, 74.20.−z, 74.72.−h (all)
DOI: 10.1070/PU2008v051n06ABEH006462
URL: https://ufn.ru/en/articles/2008/6/a/
Web of Science

000260064600001
Scopus

2-s2.0-53849110876
ADS NASA

2008PhyU...51..535M
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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