Thermal conductivity of superconducting tin films in a magnetic field
Smith, John Ernest
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https://hdl.handle.net/2142/25695
Description
Title
Thermal conductivity of superconducting tin films in a magnetic field
Author(s)
Smith, John Ernest
Issue Date
1967
Doctoral Committee Chair(s)
Ginsberg, D.M.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
thermal conductivity
superconducting tin films
magnetic field
parallel field
Landau-Ginzburg
Language
en
Abstract
We have measured the magnetic field dependence of the thermal
conductivity of superconducting tin films in a parallel field ranging
from zero to above the critical fields, and at temperatures from 0.3
to 10 K. They had electron mean free paths which were from 18% to
85% of the bulk coherence 1ength Eo. The Landau-Ginzburg parameter x o
was sufficiently enhanced by the effect of the.short mean free paths
that in our thicker films we were able to observe the surface. sheath
region of de Gennes and Saint James. We have derived an expression
for the field dependence of the thermal conductivity in this region,
based upon theoretical calculations of Caroli and Cyrot and of Maki;
this expression, which is strictly valid only in the limit l/Eo -> 0, is
in good agreement with our experimental results. We have compared
the experimental results for our thinner films with theoretical calcu
lations of the field dependence of the thermal conductivity by Maki.
These expressions are also restricted in validity to the limit l/Eo -> O.
Here the agreement between the theory and the data is not so good as
in the thick film case, but it improve as the experimental values of
l approach the limit l/Eo -> O.
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