Critical temperature of superconducting bilayers: Theory and experiment

Brammertz, G.; Golubov, A. A.; Verhoeve, P.; den Hartog, R.; Peacock, A.; Rogalla, H.
April 2002
Applied Physics Letters;4/22/2002, Vol. 80 Issue 16, p2955
Academic Journal
A generalized model for the critical temperature T[sub C] of superconducting bilayers is presented, which is valid with no restrictions to film thicknesses, T[sub C] of the layers, and interface resistivity. The model is verified experimentally on a series of Nb–Al and Ta–Al bilayers with Nb, Ta layer thicknesses of 100 nm and Al layer thicknesses ranging from 5 to 200 nm. Excellent agreement between theory and experiment was found for the energy gap and the T[sub C] of bilayers. The results are important for designing practical superconducting devices. © 2002 American Institute of Physics.


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