Superconducting proximity effect in Cu/Nb/Cu, Nb/Cu/Nb trilayers and in Nb/Pd0.81Ni0.19 bilayers has been studied. The dependence of the superconducting transition temperature Tc versus Nb thickness in Cu/Nb/Cu trilayers and versus Cu thickness in Nb/Cu/Nb trilayers is described by different sets of material parameters. We attribute this discrepancy to the influence on the superconducting properties of the external edges of Nb/Cu/Nb hybrids. This conclusion was confirmed from the results obtained for Nb/Pd0.81Ni0.19 bilayers, in which the top layer was always Pd0.81Ni0.19. In this case, in fact, the Tc dependence as a function of both Nb and Pd0.81Ni0.19 thicknesses is described by unique set of microscopic parameters.
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Prischepa, S.L., Kushnir, V.N., Ilyina, E.A., Attanasio, C., Cirillo, C., Aarts, J. (2008). Microscopic Proximity Effect Parameters In S/N And S/F Heterostructures. In: Bonča, J., Kruchinin, S. (eds) Electron Transport in Nanosystems. NATO Science for Peace and Security Series B: Physics and Biophysics. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-9146-9_20
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