Many-body effects in the thermodynamic properites of Fermi liquids and the electron-phonon system and in the excitation spectrum of liquid 4HE
Coffey, Dermot
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https://hdl.handle.net/2142/25227
Description
Title
Many-body effects in the thermodynamic properites of Fermi liquids and the electron-phonon system and in the excitation spectrum of liquid 4HE
Author(s)
Coffey, Dermot
Issue Date
1986
Doctoral Committee Chair(s)
Pethick, C.J.
Pines, David
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
many-body
thermodynamics
Fermi liquids
electron-phonon system
liquid 4He
quasiparticle spectra
Language
en
Abstract
In this thesis I study two separate topics in many-body physics. In
the first part I consider many-body effects in the thermodynamic properties
of Fermi liquids and of the electron-phonon system. Using normal liquid 3He
as an example, I show that the T3lnT corrections due to spin fluctuations
account for the finite temperature corrections to the leading term in the
specific heat. I also calculate and compare the statistical and the
dynamical quasiparticle spectra and show that differences between them
partially account for the discrepancy between the present and previous
results. Spin fluctuation parameters determined from fits to specific heat
of UPt3 and UA12 are examined and applicability of simple spin-fluctuation
models to these systems is discussed. In addition I consider the T3lnT contributions
to the specific heat of metals due to the electron-phonon coupling
and show how they may be viewed as being analogous to those from spin
fluctuations.
In the second part of the thesis I review the application of polarization
potential theory to the description of the excitations of liquid 4He
at low temperature and I use recent experimental results to determine the
parameters in the theory. I calculate the dispersion curve in the absence
of dynamic mode-mode coupling and discuss the results.
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