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Mapother, D.E. Montgomery, David Carey 2011-07-08T16:55:53Z 2011-07-08T16:55:53Z 10000-01-01 1967 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. Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-07-08T16:55:53Z No. of bitstreams: 1 1967_montgomery.pdf: 2228725 bytes, checksum: 0a07d61f8b4e3758506f10adcefc519f (MD5) Made available in DSpace on 2011-07-08T16:55:53Z (GMT). No. of bitstreams: 1 1967_montgomery.pdf: 2228725 bytes, checksum: 0a07d61f8b4e3758506f10adcefc519f (MD5) Previous issue date: 1967 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-07-08T16:55:53Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:32:48-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis Thesis U of I Only 6105147 http://hdl.handle.net/2142/25721 en 1967 David Carey Montgomery anisotropy effects critical field superconducting tin-indium alloys crystal lattice Anisotropy effects in the critical field of superconducting tin-indium alloys Dissertation / Thesis text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.