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Specific capacitance of Nb/AlO<i>x</i>/Nb Josephson junctions with critical current densities in the range of 0.1–18 kA/cm2
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1995
Year
Superconducting MaterialEngineeringSpecific CapacitanceCritical Current DensitiesSemiconductor DeviceJosephson JunctionsTunneling MicroscopyNovel SuperconductorsSuperconductivityQuantum MaterialsSuperconducting DevicesElectrical EngineeringResonance TechniqueHigh-tc SuperconductivityPhysicsApplied PhysicsCondensed Matter PhysicsQuantum Interference DeviceQuantum DevicesSpecific Capacitance CsQuantum Superconductivity
The specific capacitance Cs of Nb/AlOx/Nb Josephson tunnel junction has been measured by means of the superconducting quantum interference device (SQUID) resonance technique. We have investigated the junctions with critical current densities Jc in the range of 0.1–18 kA/cm2 and found that 1/Cs linearly depends on a logarithm of Jc. This suggests that the barrier thickness is moderately uniform in the junction area and increases continuously during growth. The results also show that increasing Jc reduces time constants of the junction.