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Proximity effect in superconductors: Experimental and theoretical determination of the transition temperature

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Title: Proximity effect in superconductors: Experimental and theoretical determination of the transition temperature
Author(s): Jacobs, Allan Edward
Doctoral Committee Chair(s): Ginsberg, D. M.
Department / Program: Physics
Discipline: Physics
Degree: Ph.D.
Genre: Dissertation
Subject(s): proximity effects superconductors transition temperature superimposed film
Abstract: 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.
Issue Date: 1968
Genre: Dissertation / Thesis
Type: Text
Language: English
URI: http://hdl.handle.net/2142/25750
Rights Information: 1968 Allan Edward Jacobs
Date Available in IDEALS: 2011-07-11
Identifier in Online Catalog: 6079084
 

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