The superconducting penetration depth in thin films of lead
Kerchner, Harold Richard
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https://hdl.handle.net/2142/28331
Description
Title
The superconducting penetration depth in thin films of lead
Author(s)
Kerchner, Harold Richard
Issue Date
1974
Doctoral Committee Chair(s)
Ginsberg, D.M.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
superconducting
Language
en
Abstract
We measured the attenuation of an axial magnetic field by cylindrical
thin films of superconducting lead. We also measured the normal-state resistance
of the same films. The magnetic field was measured by using a
superconducting magnetometer. From the temperature dependence of the normalstate
resistance, we determined the film thickness and the electron mean free
path. From the field attenuation, the film thickness, and the mean free path,
we derived the superconducting conductivity, the London penetration depth ~
and penetration depth A, which would be expected for pure, bulk lead. In
order to interpret our field-attenuation measurements, we found it important
to know the value of the electromagnetic coherence length as a function of
temperature. To this end and to compare our experimental results with theory,
we calculated the coherence length and the superconducting conductivity at
finite temperatures by using the strong-coupling theory of superconducting
lead. Our experimental results for the superconducting conductivity at zero
temperature and its temperature dependence agree well with our own theoretical
results and previous, zero-temperature, theoretical results. We find the
bulk zero-temperature penetration depth A(O) should be 453 + 8 K.
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