Experimental observation of subharmonic gap structures in long Josephson junctions

M.A. Nordahn; Martin Manscher; Jesper Mygind; L.V. Filippenko

doi:10.1088/0953-2048/12/11/380

Experimental observation of subharmonic gap structures in long Josephson junctions

M.A. Nordahn, Martin Manscher, Jesper Mygind, L.V. Filippenko

Department of Physics

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

The subharmonic gap structure (SGS) in long-overlap Nb-AlOx-Nb Josephson tunnel junctions has been investigated. The experimental results show peaks in the differential conductance at both odd and even integer fractions of the gap voltage, VG Furthermore, the conductance peaks at V-G/2 has been observed to split into two peaks with different characteristics. At high magnetic fields, the I-V characteristics approach a single curve, while retaining the SGS conductance peaks. The gap structure and the SGS show the same temperature dependence. The SGS can be explained by a Josephson self-coupling effect or multiple Andreev reflections. The results are important for the development of the flux flow oscillator used a local oscillator in integrated all-superconducting 200-800 GHz receivers.

Original language	English
Journal	Superconductor Science & Technology
Volume	12
Issue number	11
Pages (from-to)	963-966
ISSN	0953-2048
DOIs	https://doi.org/10.1088/0953-2048/12/11/380
Publication status	Published - 1999

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title = "Experimental observation of subharmonic gap structures in long Josephson junctions",

abstract = "The subharmonic gap structure (SGS) in long-overlap Nb-AlOx-Nb Josephson tunnel junctions has been investigated. The experimental results show peaks in the differential conductance at both odd and even integer fractions of the gap voltage, VG Furthermore, the conductance peaks at V-G/2 has been observed to split into two peaks with different characteristics. At high magnetic fields, the I-V characteristics approach a single curve, while retaining the SGS conductance peaks. The gap structure and the SGS show the same temperature dependence. The SGS can be explained by a Josephson self-coupling effect or multiple Andreev reflections. The results are important for the development of the flux flow oscillator used a local oscillator in integrated all-superconducting 200-800 GHz receivers. ",

author = "M.A. Nordahn and Martin Manscher and Jesper Mygind and L.V. Filippenko",

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TY - JOUR

T1 - Experimental observation of subharmonic gap structures in long Josephson junctions

AU - Nordahn, M.A.

AU - Manscher, Martin

AU - Mygind, Jesper

AU - Filippenko, L.V.

PY - 1999

Y1 - 1999

N2 - The subharmonic gap structure (SGS) in long-overlap Nb-AlOx-Nb Josephson tunnel junctions has been investigated. The experimental results show peaks in the differential conductance at both odd and even integer fractions of the gap voltage, VG Furthermore, the conductance peaks at V-G/2 has been observed to split into two peaks with different characteristics. At high magnetic fields, the I-V characteristics approach a single curve, while retaining the SGS conductance peaks. The gap structure and the SGS show the same temperature dependence. The SGS can be explained by a Josephson self-coupling effect or multiple Andreev reflections. The results are important for the development of the flux flow oscillator used a local oscillator in integrated all-superconducting 200-800 GHz receivers.

AB - The subharmonic gap structure (SGS) in long-overlap Nb-AlOx-Nb Josephson tunnel junctions has been investigated. The experimental results show peaks in the differential conductance at both odd and even integer fractions of the gap voltage, VG Furthermore, the conductance peaks at V-G/2 has been observed to split into two peaks with different characteristics. At high magnetic fields, the I-V characteristics approach a single curve, while retaining the SGS conductance peaks. The gap structure and the SGS show the same temperature dependence. The SGS can be explained by a Josephson self-coupling effect or multiple Andreev reflections. The results are important for the development of the flux flow oscillator used a local oscillator in integrated all-superconducting 200-800 GHz receivers.

U2 - 10.1088/0953-2048/12/11/380

DO - 10.1088/0953-2048/12/11/380

M3 - Journal article

VL - 12

SP - 963

EP - 966

JO - Superconductor Science & Technology

JF - Superconductor Science & Technology

SN - 0953-2048

IS - 11

ER -