Physical Review B, volume 77, issue 16, publication number 165408

Proximity dc squids in the long-junction limit

L. Angers 1
F Chiodi 1
G. Montambaux 1
M. Ferrier 1
S Guéron 1
H. Bouchiat 1
H Bouchiat 1
J C Cuevas 2
Juan Lagarda Cuevas 2
Publication typeJournal Article
Publication date2008-04-07
Quartile SCImago
Q1
Quartile WOS
Q2
Impact factor3.7
ISSN24699950, 24699969, 10980121, 1550235X
Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Abstract
We report the design and measurement of Superconducting/normal/superconducting (SNS) proximity DC squids in the long junction limit, i.e. superconducting loops interrupted by two normal metal wires roughly a micrometer long. Thanks to the clean interface between the metals, at low temperature a large supercurrent flows through the device. The dc squid-like geometry leads to an almost complete periodic modulation of the critical current through the device by a magnetic flux, with a flux periodicity of a flux quantum h/2e through the SNS loop. In addition, we examine the entire field dependence, notably the low and high field dependence of the maximum switching current. In contrast with the well-known Fraunhoffer-type oscillations typical of short wide junctions, we find a monotonous gaussian extinction of the critical current at high field. As shown in [15], this monotonous dependence is typical of long and narrow diffusive junctions. We also find in some cases a puzzling reentrance at low field. In contrast, the temperature dependence of the critical current is well described by the proximity effect theory, as found by Dubos et al. [16] on SNS wires in the long junction limit. The switching current distributions and hysteretic IV curves also suggest interesting dynamics of long SNS junctions with an important role played by the diffusion time across the junction.

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Angers L. et al. Proximity dc squids in the long-junction limit // Physical Review B. 2008. Vol. 77. No. 16. 165408
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Angers L., Chiodi F., Chiodi F., Montambaux G., Ferrier M., Guéron S., Bouchiat H., Bouchiat H., Cuevas J. C., Lagarda Cuevas J. Proximity dc squids in the long-junction limit // Physical Review B. 2008. Vol. 77. No. 16. 165408
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RIS Copy
TY - JOUR
DO - 10.1103/PhysRevB.77.165408
UR - https://doi.org/10.1103/PhysRevB.77.165408
TI - Proximity dc squids in the long-junction limit
T2 - Physical Review B
AU - Angers, L.
AU - Chiodi, F
AU - Montambaux, G.
AU - Ferrier, M.
AU - Guéron, S
AU - Bouchiat, H.
AU - Cuevas, J C
AU - Chiodi, Francesca
AU - Bouchiat, H
AU - Lagarda Cuevas, Juan
PY - 2008
DA - 2008/04/07
PB - American Physical Society (APS)
IS - 16
VL - 77
SN - 2469-9950
SN - 2469-9969
SN - 1098-0121
SN - 1550-235X
ER -
BibTex
Cite this
BibTex Copy
@article{2008_Angers,
author = {L. Angers and F Chiodi and G. Montambaux and M. Ferrier and S Guéron and H. Bouchiat and J C Cuevas and Francesca Chiodi and H Bouchiat and Juan Lagarda Cuevas},
title = {Proximity dc squids in the long-junction limit},
journal = {Physical Review B},
year = {2008},
volume = {77},
publisher = {American Physical Society (APS)},
month = {apr},
url = {https://doi.org/10.1103/PhysRevB.77.165408},
number = {16},
doi = {10.1103/PhysRevB.77.165408}
}
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