Low temperature specific heat of Sn and Sn-In alloys
Wilkes, William Roy
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https://hdl.handle.net/2142/25079
Description
Title
Low temperature specific heat of Sn and Sn-In alloys
Author(s)
Wilkes, William Roy
Issue Date
1966
Doctoral Committee Chair(s)
Mapother, D.E.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
low temperature specific heat
tin
tin alloys
adiabatic calorimeter
Language
en
Abstract
The normal state specific heats of pure tin and alloys consisting of
0.5, 1, 2, 4, and 6 atomic percent indium in tin have been measured between
about 0.4 and 4. 2 oK. All of the alloys lie within the solid solubility
limit of indium in tin. Measurements were made in an adiabatic calorimeter
cooled by a He
3
refrigerator, with the specimens magnetically quenched
from the superconducting state. Additional cooling of some specimens was
possible by adiabatic magnetization to achieve temperatures as low as
0.24
o
K. The results for pure tin are compared with recent data for the
temperature coefficient of the norITlal electronic specific heat, tf , and the
Debye temperature, r:; . The results for the alloys are interpreted in
terms of the variation in '( and &, and comparisons are made with recent
determinations of the variations of (f and a with increasing indium concentration.
While the variation of e is in reasonable agreement with
reported values, the variation of --( with increasing indium content is
positive, in disagreement with previously reported data. The results are
also discussed in the light of the theories of Markowitz and Kadanoff and
of Ginsberg on the variation of the critical temperatures of superconductors
with alloying.
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