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thermal conductivity superconducting tin films magnetic field parallel field Landau-Ginzburg Thermal conductivity of superconducting tin films in a magnetic field Dissertation / Thesis text Ginsberg, D.M. Smith, John Ernest 2011-07-07T16:50:11Z 2011-07-07T16:50:11Z 10000-01-01 1967 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. Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-07-07T16:50:11Z No. of bitstreams: 1 1967_smith.pdf: 3554324 bytes, checksum: 6975c6c87d0e809f8c64acfb60d64660 (MD5) Made available in DSpace on 2011-07-07T16:50:11Z (GMT). No. of bitstreams: 1 1967_smith.pdf: 3554324 bytes, checksum: 6975c6c87d0e809f8c64acfb60d64660 (MD5) Previous issue date: 1967 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-07-07T16:50:11Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:32:45-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis Thesis U of I Only 2674884 http://hdl.handle.net/2142/25695 en 1967 John Ernest Smith Jr. Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.