Proximity effect Nb/Al,AlOxide, Al/Nb Josephson tunnel junctions

Evert Pieter Houwman, Hans Gijsbertsen, Jakob Flokstra, Horst Rogalla, J.B. Le grand, P.A.J. de Korte, Alexandre Avraamovitch Golubov

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Abstract

Regions with reduced energy gap induced by the proximity effect give rise to quasi-particle loss in Josephson-junction X-ray detectors, but may also be used advantageously for quasi-particle collection. The influence of the thickness of the Al proximity layers in Nb/Al1 , AlOx, Al2/Nb Josephson tunnel junctions on the electrical characteristics has been investigated theoretically and experimentally. Theoretically it is found that the strength of the proximity effect is mainly determined by the proximity effect is mainly determined by the proximity parameters γM1 (γM2) of the electrodes. Good fits of the measured I-V curves with theory were obtained for junctions with thicknesses dA11 ranging from 4 to 25 nm and dA12=3 nm, with γM2≈0.12 and γM1/γM2=dA11/d A12. For all junctions the proximity knee remains more pronounced than predicted.
Original languageEnglish
Pages (from-to)2170-2171
Number of pages2
JournalIEEE transactions on applied superconductivity
Volume3
Issue number1
DOIs
Publication statusPublished - 1993
Event1992 Applied Superconductivity Conference, ASC 1992 - Chicago, United States
Duration: 23 Aug 199228 Aug 1992

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Tunnel junctions
tunnel junctions
proximity
Energy gap
elementary excitations
Detectors
X rays
Electrodes
Josephson junctions
electrodes
detectors
curves
x rays

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title = "Proximity effect Nb/Al,AlOxide, Al/Nb Josephson tunnel junctions",
abstract = "Regions with reduced energy gap induced by the proximity effect give rise to quasi-particle loss in Josephson-junction X-ray detectors, but may also be used advantageously for quasi-particle collection. The influence of the thickness of the Al proximity layers in Nb/Al1 , AlOx, Al2/Nb Josephson tunnel junctions on the electrical characteristics has been investigated theoretically and experimentally. Theoretically it is found that the strength of the proximity effect is mainly determined by the proximity effect is mainly determined by the proximity parameters γM1 (γM2) of the electrodes. Good fits of the measured I-V curves with theory were obtained for junctions with thicknesses dA11 ranging from 4 to 25 nm and dA12=3 nm, with γM2≈0.12 and γM1/γM2=dA11/d A12. For all junctions the proximity knee remains more pronounced than predicted.",
author = "Houwman, {Evert Pieter} and Hans Gijsbertsen and Jakob Flokstra and Horst Rogalla and {Le grand}, J.B. and {de Korte}, P.A.J. and Golubov, {Alexandre Avraamovitch}",
year = "1993",
doi = "10.1109/77.233933",
language = "English",
volume = "3",
pages = "2170--2171",
journal = "IEEE transactions on applied superconductivity",
issn = "1051-8223",
publisher = "IEEE",
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}

Proximity effect Nb/Al,AlOxide, Al/Nb Josephson tunnel junctions. / Houwman, Evert Pieter; Gijsbertsen, Hans; Flokstra, Jakob; Rogalla, Horst; Le grand, J.B.; de Korte, P.A.J.; Golubov, Alexandre Avraamovitch.

In: IEEE transactions on applied superconductivity, Vol. 3, No. 1, 1993, p. 2170-2171.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Proximity effect Nb/Al,AlOxide, Al/Nb Josephson tunnel junctions

AU - Houwman, Evert Pieter

AU - Gijsbertsen, Hans

AU - Flokstra, Jakob

AU - Rogalla, Horst

AU - Le grand, J.B.

AU - de Korte, P.A.J.

AU - Golubov, Alexandre Avraamovitch

PY - 1993

Y1 - 1993

N2 - Regions with reduced energy gap induced by the proximity effect give rise to quasi-particle loss in Josephson-junction X-ray detectors, but may also be used advantageously for quasi-particle collection. The influence of the thickness of the Al proximity layers in Nb/Al1 , AlOx, Al2/Nb Josephson tunnel junctions on the electrical characteristics has been investigated theoretically and experimentally. Theoretically it is found that the strength of the proximity effect is mainly determined by the proximity effect is mainly determined by the proximity parameters γM1 (γM2) of the electrodes. Good fits of the measured I-V curves with theory were obtained for junctions with thicknesses dA11 ranging from 4 to 25 nm and dA12=3 nm, with γM2≈0.12 and γM1/γM2=dA11/d A12. For all junctions the proximity knee remains more pronounced than predicted.

AB - Regions with reduced energy gap induced by the proximity effect give rise to quasi-particle loss in Josephson-junction X-ray detectors, but may also be used advantageously for quasi-particle collection. The influence of the thickness of the Al proximity layers in Nb/Al1 , AlOx, Al2/Nb Josephson tunnel junctions on the electrical characteristics has been investigated theoretically and experimentally. Theoretically it is found that the strength of the proximity effect is mainly determined by the proximity effect is mainly determined by the proximity parameters γM1 (γM2) of the electrodes. Good fits of the measured I-V curves with theory were obtained for junctions with thicknesses dA11 ranging from 4 to 25 nm and dA12=3 nm, with γM2≈0.12 and γM1/γM2=dA11/d A12. For all junctions the proximity knee remains more pronounced than predicted.

U2 - 10.1109/77.233933

DO - 10.1109/77.233933

M3 - Article

VL - 3

SP - 2170

EP - 2171

JO - IEEE transactions on applied superconductivity

JF - IEEE transactions on applied superconductivity

SN - 1051-8223

IS - 1

ER -