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Ginsberg, D.M. Jacobs, Allan Edward 2011-07-11T15:39:55Z 2011-07-11T15:39:55Z 10000-01-01 1968 This thesis is a report of the results of experimental and theoretical investigations of the proximity effect in superconductors, with particular reference to the measurement and prediction of the transition temperature of superimposed films. The theoretical work consists of two parts: (1) an extension of the diffusion approximation theory due to de Gennes, Guyon and Werthamer; this theory is valid only when the mean free paths in the two metals are small compared to the respective coherence lengths, (ii) an extension, under certain restrictive assumptions, of the above theory to all values of the mean free paths. The experimental work consists of measurements of the transition temperature of superimposed films of indium and thallium deposited at low temperatures. The experimental results are in good over-all agreement with the theory but small deviations are observed. Similar but far less extensive measurements have also been made for lead-indium films, for which the strong electron-phonon coupling in lead might invalidate the theory. The experimental results are again in good agreement with the theory, showing that the strong-coupling effects are not large. Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-07-11T15:39:55Z No. of bitstreams: 1 1968_jacobs.pdf: 5801982 bytes, checksum: ee952d9d06c323e33cb4e364bb39cd77 (MD5) Made available in DSpace on 2011-07-11T15:39:55Z (GMT). No. of bitstreams: 1 1968_jacobs.pdf: 5801982 bytes, checksum: ee952d9d06c323e33cb4e364bb39cd77 (MD5) Previous issue date: 1968 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-07-11T15:39:55Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:32:53-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis Thesis U of I Only 6079084 http://hdl.handle.net/2142/25750 en 1968 Allan Edward Jacobs proximity effects superconductors transition temperature superimposed film Proximity effect in superconductors: Experimental and theoretical determination of the transition temperature Dissertation / Thesis text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.