Heat capacity of dilute solutions of liquid He[superscript 3] in He[superscript 4] at low temperatures
Roach, William Ronald
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https://hdl.handle.net/2142/25069
Description
Title
Heat capacity of dilute solutions of liquid He[superscript 3] in He[superscript 4] at low temperatures
Author(s)
Roach, William Ronald
Issue Date
1966
Doctoral Committee Chair(s)
Wheatley, J.C.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
low temperature heat capacity
Helium 3
Helium 4
saturated vapor pressure
Language
en
Abstract
Heat capacity measurements were made on two dilute solutions
of 1iquid He3 in He4. These data, taken under saturated vapor
o 0 pressure at temperatures between .005 K and .20 K, are characteristic
of an ideal Fermi gas with m'l'< dependent only slightly on concentration.
The solution with a molar concentration of Re3 of (1.32 ± .01)% had a
degeneracy temperature of (.141 ± .002)oK and m*/m = 2.38 ±.04.
For the solution with a (5.02 -+ .03)% concentration of He3 the degenetacy
temperature was (.331 ± .004)oK while m*/m = 2,46 ± .04. The
slight dependence of m* on concentration can be explained in, terms of
the Landau theory of a Fermi liquid. The perturbation method, which
Bardeen, Baym j and Pines used to determine an,effective potential
v(q) between He 3 quasiparticles from later data on the magnetic properties of these solutions, was used to estimate the low temperature
contribution of the He 3 quasipartic1es to the thermal conductivity
and viscosity of dilute solutions.
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