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- Title
Magnetometry with Low-Resistance Proximity Josephson Junction.
- Authors
Jabdaraghi, R. N.; Peltonen, J. T.; Golubev, D. S.; Pekola, J. P.
- Abstract
We characterize a niobium-based superconducting quantum interference proximity transistor (Nb-SQUIPT) and its key constituent formed by a Nb-Cu-Nb SNS weak link. The Nb-SQUIPT and SNS devices are fabricated simultaneously in two separate lithography and deposition steps, relying on Ar ion cleaning of the Nb contact surfaces. The quality of the Nb-Cu interface is characterized by measuring the temperature-dependent equilibrium critical supercurrent of the SNS junction. In the Nb-SQUIPT device, we observe a maximum flux-to-current transfer function value of about 55nA/Φ0<inline-graphic></inline-graphic> in the sub-gap regime of bias voltages. This results in suppression of power dissipation down to a few fW. Low-bias operation of the device with a relatively low probe junction resistance decreases the dissipation by up to two orders of magnitude compared to a conventional device based on an Al-Cu-Al SNS junction and an Al tunnel probe (Al-SQUIPT).
- Subjects
JOSEPHSON junctions; SUPERCONDUCTING quantum interference devices; TRANSISTORS; ENERGY dissipation; ARGON
- Publication
Journal of Low Temperature Physics, 2018, Vol 191, Issue 5/6, p344
- ISSN
0022-2291
- Publication type
Article
- DOI
10.1007/s10909-018-1863-x