Article Dans Une Revue Journal of Applied Physics Année : 2010

Electrical parameters of niobium-based overdamped superconductor - normal metal - insulator-superconductor Josephson junctions for digital applications

Résumé

We have demonstrated superconductor-normal metal-insulator-superconductor Nb/Al–AlOx/Nb Josephson junctions developed with Al layer thicknesses between 30 and 100 nm, resulting in nonhysteretic current-voltage characteristics for critical current densities between 20 and 60 kA/cm2. Specific capacitances ranged from 180 to 480 fF/μm2, depending on temperature and of barrier deposition conditions. It is shown that the high capacitance seen by the junction depends on the Josephson junction barrier but only to a least extent on the parasitic environment. Although the specific capacitance is unusually high, Stewart–McCumber parameters from 1 to 3, at 4.2 K, optimum for digital single-flux-quantum applications were obtained without external shunting.

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hal-00596319 , version 1 (31-01-2025)

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Pascal Febvre, David Bouis, Natascia de Leo, Matteo Fretto, Andrea Sosso, et al.. Electrical parameters of niobium-based overdamped superconductor - normal metal - insulator-superconductor Josephson junctions for digital applications. Journal of Applied Physics, 2010, 107 (10), pp.103927. ⟨10.1063/1.3354090⟩. ⟨hal-00596319⟩
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