Fabrication and Noise Properties of NbN Nanobridge dc Superconducting QUantum Interference Devices (SQUIDs)

Autor: Irie, Akinobu, Abe, Hiroya, Michal Hatle, Michal Hatle, Katsuyoshi Hamasaki, Katsuyoshi Hamasaki
Zdroj: Japanese Journal of Applied Physics; December 1991, Vol. 30 Issue: 12 p3925-3925, 1p
Abstrakt: We have fabricated two types of NbN nanobridge dc Superconducting QUantum Interference Devices (SQUIDs). From the analyses of the response to magnetic field, it is found that the current-phase relationship for the planar-type nanobridge and the nanobridge fabricated by field evaporation is close to sinusoidal. For V\gtrsim720 µV, The spectral densities of the voltage noise show linear dependence on the voltage for the SQUIDs with nanobridges whose length is about the superconducting coherence length of NbN. The SQUIDs with nanobridges with lengths of several times the NbN coherence length exhibit parabolic voltage dependence.
Databáze: Supplemental Index