The superconducting proximity effect as a tool to investigate metal films and interfaces
University of Southern California, Los Angeles, CA 90089-0484, USA
Corresponding author: a email@example.com
Revised: 17 April 2004
Published online: 29 June 2004
The superconducting proximity effect is measured in sandwiches of thin Pb films and the alkali metals Cs, Rb, K and Na. The Tc-dependence provides information about the interface barriers between Pb and the alkalis. Such a barrier is particularly large in Pb/Cs sandwiches. It is not due to impurities or oxydation. In the presence of a sufficiently strong barrier a special form of the Cooper limit can be applied to calculate the transition temperature of the sandwich.
PACS: 74.50.+r – Tunneling phenomena; point contacts, weak links, Josephson effects / 73.20.-r – Electron states at surfaces and interfaces / 71.20.Dg – Alkali and alkaline earth metals
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2004