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https://hdl.handle.net/2142/23969
Description
Title
Thermal conductivity of liquid helium three
Author(s)
Connolly, John Irving
Issue Date
1965
Doctoral Committee Chair(s)
Wheatley, J.C.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
thermal conductivity
liquid helium
He3
Fermi liquid theory
Language
en
Abstract
We have measured the thermal conductivity of liquid He3 at
low pressure from O. 055 0 K to O. 47
o
K, at 99.8 psi from O. 0550 K to
O. 750 K and at 396.8 psi from O. 0550 K to O. 87
o
K. At all pressures and
at sufficiently low temperatures the thermal conductivity increases with
decreasing temperature. At low pressures our data agree with the data
of Anderson et al* which, at temperatures lower than those investigated
in this experiment, agreed with the T-
1
temperature dependence predicted
by Fermi liquid theory. At higher pres sures we definitely do not go low
enough in temperature for the simple Fermi liquid picture to be valid. At
high temperatures the conductivity increases slowly with increasing temperature.
Near 10K the effect of pressure on the conductivity, large at
lower temperatures, has become very small. At all temperatures the
conductivity decreases with increasing pressure. As the pressure is increased
the minimum in the conductivity occurs at a lower temperature.
These data have provided an experimental basis for theories of
transport properties at temperature s too high for the simple Fermi liquid
picture to be valid but in a region where degeneracy effects ate still
important. The re sults of the se measurements will be published by
the author, A. C. Anderson, O. E. Vilches, and J. C. Wheatley.
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