The Proximity and Josephson Effects in Niobium Nitride–Aluminum Bilayers

Highly disordered thin films of niobium nitride and the specific features of the proximity effect in NbN (S)–aluminum (N) bilayers with a large resistivity ratio, ρ NbN /ρ Al 1, are studied. It is shown that magnetic screening and the critical current I c of such SN structures significantly increase...

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Bibliographic Details
Published inPhysics of the solid state Vol. 61; no. 9; pp. 1544 - 1548
Main Authors Levichev, M. Yu, El’kina, A. I., Bukharov, N. N., Petrov, Yu. V., Aladyshkin, A. Yu, Vodolazov, D. Yu, Klushin, A. M.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.09.2019
Springer
Springer Nature B.V
Subjects
ALUMINIUM
Aluminum
Bilayers
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRITICAL CURRENT
Critical current (superconductivity)
Dielectric films
JOSEPHSON EFFECT
Niobium nitride
NIOBIUM NITRIDES
Nitrides
Physics
Physics and Astronomy
Proximity
PROXIMITY EFFECT
Proximity effect (electricity)
Resistivity ratio
Solid State Physics
SUPERCONDUCTIVITY
Superconductors
THICKNESS
THIN FILMS
Variable thickness
superconductivity
proximity effect
Josephson effect
Josephson junction
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Summary:Highly disordered thin films of niobium nitride and the specific features of the proximity effect in NbN (S)–aluminum (N) bilayers with a large resistivity ratio, ρ NbN /ρ Al 1, are studied. It is shown that magnetic screening and the critical current I c of such SN structures significantly increase compared to the S layer. The observed effect is associated with the induced superconductivity in the N layer due to the proximity effect. The Josephson effect is demonstrated in NbN/Al–NbN–NbN/Al variable thickness bridges made of such SN bilayers.
ISSN:1063-7834
1090-6460
DOI:10.1134/S1063783419090142