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Title:Anisotropy effects in the critical field of superconducting tin-indium alloys
Author(s):Montgomery, David Carey
Doctoral Committee Chair(s):Mapother, D.E.
Department / Program:Physics
Subject(s):anisotropy effects
critical field
superconducting tin-indium alloys
crystal lattice
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.
Issue Date:1967
Genre:Dissertation / Thesis
Rights Information:1967 David Carey Montgomery
Date Available in IDEALS:2011-07-08
Identifier in Online Catalog:6105147

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