Anisotropy effects in the critical field of superconducting tin-indium alloys
Montgomery, David Carey
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https://hdl.handle.net/2142/25721
Description
Title
Anisotropy effects in the critical field of superconducting tin-indium alloys
Author(s)
Montgomery, David Carey
Issue Date
1967
Doctoral Committee Chair(s)
Mapother, D.E.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
anisotropy effects
critical field
superconducting tin-indium alloys
crystal lattice
Language
en
Abstract
Measurements have been made of the critical-field curve, Hc
versus T, for eight superconducting dilute alloys of indium in tin
near the critical temperature and at low temperatures extending to
about 0.30 K. The effective magnitude of the superconducting energy
gap is sensitive to the direction of the electron momentum relative
to the crystal lattice - the so-called anisotropy effect. The reduction
in electron mean free path which occurs upon addition of indium
to pure tin reduces the effect of anisotropy in the electron-electron
interaction. The decrease in the effect of anisotropy has been
observed to depress the critical temperature Tc, the 0oK critical
field Ho and the constant K = 2nyTc2/(VH2). In terms of the reduced
critical-field curve, impurity additions are found to reduce the
deviation from the parabolic law, h = 1 - t2. The observations
are explained by theoretical predictions of Clem for which the meansquared
anisotropy in pure tin is taken to be (a2) = .014 ± .001.
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