Peculiarities of the Electron-Phonon Interaction during Change of Topology of the Fermi Surface in Metals
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Date
1983-06
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Addis Ababa University
Abstract
The necessary background material for the analysis of the
electron phonon interaction with respect to·the absorption
coefficient and change in incident phonon frequency is discussed
in the first and second chapters of this thesis. At the end of
the second chapter the Migdal-Kohn Bnomalies for a spherical
Fermi surface is dis~ussed. Experimental varification and phisical
sense of these anomalies is also presented here.
An investigation of the change in the phonon spectrum due
to the Migdal-Kohn anomalies for some important cases of change
in topology of the Fermi surface in metals is done in chapter
three. In general it is found that the anomalies in rand Aw
depend on the changes of the Fermi surface topology caused at
phase transition of order 21. Also it ia noted that the singularities
in rand Aw ~re interdependent as can be predicted by
the Kramer's and Kronig relations
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Keywords
Peculiarities of the Electron-Phonon Interaction