Proximity effect model of ultra-narrow NbN strips

Abstract

We show that narrow superconducting strips in superconducting (S) and normal (N) states are universally described by the model presenting them as lateral NSN proximity systems in which the superconducting central band is sandwiched between damaged edge-bands with suppressed superconductivity.The width of the superconducting band was experimentally determined from the value of magnetic field at which the band transits from the Meissner state to the static vortex state. Systematic experimental study of 4.9 nm thick NbN strips with widths in the interval from 50 nm to 20 $\mu$m, which are all smaller than the Pearl's length, demonstrates gradual evolution of the temperature dependence of the critical current with the change of the strip width.

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Cited by in corpus (11)

• Optical single photon detection in micron-scaled NbN bridges
• Determining the depairing current in superconducting nanowire single-photon detectors
• Epitaxial niobium nitride superconducting nanowire single-photon detectors
• Large Enhancement of Critical Current in Superconducting Devices by Gate Voltage
• Self-Heating Hotspots in Superconducting Nanowires Cooled by Phonon Black-Body Radiation
• Physical properties of amorphous molybdenum silicide films for single photon detectors
• Josephson Coupling in the Dissipative State of a Thermally Hysteretic $\mu$-SQUID
• Phonon heat capacity and self-heating normal domains in NbTiN nanostrips
• Local thermal fluctuations in current-carrying superconducting nanowires
• Enhancement of optical response in nanowires by negative-tone PMMA lithography
• Parameter extraction for a superconducting thermal switch (hTron) SPICE model