Fabrication and noise properties of NbN nanobridge dc superconducting QUantum interference devices (SQUIDs)

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...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 1991-12, Vol.30 (12B), p.3925-3928
Main Authors: IRIE, A, ABE, H, HATLE, M, HAMASAKI, K
Format: Article
Language:English
Subjects:
Applied sciences
Electronics
Exact sciences and technology
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Superconducting devices
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Summary: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.
ISSN:0021-4922
1347-4065
DOI:10.1143/jjap.30.3925