Magnetic properties of dilute solutions of liquid He³ in He⁴ at low temperatures
Sarwinski, Raymond Joseph
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https://hdl.handle.net/2142/25071
Description
Title
Magnetic properties of dilute solutions of liquid He³ in He⁴ at low temperatures
Author(s)
Sarwinski, Raymond Joseph
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)
magnetic properties of dilute solutions
liquid helium
spin-diffusion coefficient
magnetic susceptibility
Language
en
Abstract
The spin-diffusion coefficient and magnetic
susceptibility of dilute solutions of He3 in He4 has been
measured down to about 3moK. These measurements were made
on two solutions of nominal concentrations of 1.3 and
5.0% He3 in He4 under their own vapor pressures. The
values of the diffusion coefficient fit T*-2 laws below
about 10moK for the 1.3% and below about 30mQK for the
5.0% solutions in agreement with the Landau model of a
Fermi liquid. The susceptibility is found to be constant
at sufficiently low temperatures also in agreement with the
Landau model. Dilute solutions of He3 in He4 are found to
behave as weakly interacting Fermi systems with the
advantage that the concentration, and therefore the Fermi
temperature, can be varied from 0 to about 6% He3• Sirlce
the system is weakly interacting, perturbation theory can
be applied and the effective interaction potential between
He3 particles can be deduced from measurements of the properties
of these solutions at different concentrations.
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