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Electrical properties of Al-Ge granular superconducting films Open Access


Other title
Granular superconducting films
Type of item
Degree grantor
University of Alberta
Author or creator
Yang, Yikai
Supervisor and department
Davis, John (Physics)
Examining committee member and department
Beamish, John (Physics)
Beach, Kevin (Physics)
Marsiglio, Frank (Physics)
Davis, John (Physics)
Department of Physics

Date accepted
Graduation date
Master of Science
Degree level
A granular superconductor is a system that consists of two types of materials, one is superconducting, and the other is insulating. Instead of alloying, these two materials form a granular structure where superconducting grains are embed in an insulating matrix. This is a seemingly simple structure, yet has complicated consequences that, to this day, physicists don't fully comprehend. In this dissertation, I will first give a brief review of the background theories and the development of the field of granular superconductors. Then account in details how we conducted a series of resistivity measurements with and without magnetic field. In the last part, I will also make an attempt to analyze the recent results we obtained and hopefully will shine light on the mystery of granular superconductors.
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
Citation for previous publication
James Annett. Superconductivity, Super fluids and Condensates. Oxford University Press, 2004.Y.Shapira and G.Deutscher. "Semiconductor-superconductor transition in granular Al-Ge". In: Physical Review B 27.7 (1982).Frank Pobell. Matter and Methods at low temperatures. Spinger, 2006.H.F. Hess et al. Scanning-tunneling-microscope observation of the Abrikosov flux lattice and the density of states near and inside a fluxoid. In: Physical Review Letter 62.2 (1989).G. Deutscher and S.A. Dodds. Critical-fi eld anisotropy and fluctuation conductivity in granular aluminum films. In: Physical Review B 16.9 (1977)B. Abeles, R.W. Cohen, and G.W. Cullen. Enhancement of superconductivity in metal films. In: Physical Review Letters 17.12 (1966).O.F. Kammerer and M. Strongin. Superconductivity in Tungsten films. In: Physics Letters 17.3 (1965).G. Deutscher, O. Entin-Wohlman, and Y. Shapira. Upper critical fi elds in granular superconductors. In: Physical Review B 22.9 (1980).

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