Parameters of the Tunnel Barrier of Superconducting Niobium-Based Structures

The main parameters of the tunnel barrier of Josephson Nb/AlO x /Nb and Nb/AlN/Nb junctions are estimated in a wide range of the current density using the Simmons method. The dependences of the tunnel barrier height and width of the resistivity are determined experimentally for each type of the junc...

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Bibliographic Details
Published in:Physics of the solid state 2020-09, Vol.62 (9), p.1534-1538
Main Authors: Paramonov, M. E., Filippenko, L. V., Dmitriev, P. N., Fominsky, M. Yu, Ermakov, A. B., Koshelets, V. P.
Format: Article
Language:English
Subjects:
Aluminum compounds
Comparative analysis
Current density
Electric properties
Interlayers
Metals
Niobium
Parameters
Physics
Physics and Astronomy
Solid State Physics
Superconductors
Thickness
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Summary:The main parameters of the tunnel barrier of Josephson Nb/AlO x /Nb and Nb/AlN/Nb junctions are estimated in a wide range of the current density using the Simmons method. The dependences of the tunnel barrier height and width of the resistivity are determined experimentally for each type of the junctions. A decrease in the tunnel barrier height of the junction with the AlN interlayer by 0.3 eV as compared to an oxide junction enables us to obtain the junctions with a current density higher than 15 kA/cm 2 at an insulating layer thickness of 10 Å allowable technologically, which gives the possibility to obtain quality parameter R j / R n no lower than 25.
ISSN:1063-7834
1090-6460
DOI:10.1134/S1063783420090231