The superconducting proximity effect as a tool to investigate metal films and interfaces
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چکیده
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
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تاریخ انتشار 2004