AC Josephson effect in superconducting niobium nitride tunnel junctions at up to 2.5 THz

1990 ◽  
Vol 26 (9) ◽  
pp. 610 ◽  
Author(s):  
M.C. Wicks ◽  
P.R. Haycocks ◽  
T. Hori
Keyword(s):  
Josephson Effect ◽  
Tunnel Junctions ◽  
Niobium Nitride

Effects of noise on the dc and far-infrared Josephson effect in small-area superconducting tunnel junctions

1984 ◽  
Vol 30 (5) ◽  
pp. 2503-2516 ◽  
Author(s):  
W. C. Danchi ◽  
J. Bindslev Hansen ◽  
M. Octavio ◽  
F. Habbal ◽  
M. Tinkham
Keyword(s):  
Small Area ◽  
Josephson Effect ◽  
Tunnel Junctions ◽  
Far Infrared ◽  
Superconducting Tunnel Junctions

NONSTATIONARY JOSEPHSON EFFECT AND QUASIPARTICLE TUNNELING BETWEEN PARTIALLY-DIELECTRIZED SUPERCONDUCTORS WITH CHARGE-DENSITY WAVES

1993 ◽  
Vol 07 (22) ◽  
pp. 3927-3935 ◽  
Author(s):  
A.M. GABOVICH
Keyword(s):  
Experimental Data ◽  
Fermi Surface ◽  
Charge Density ◽  
Excitation Spectrum ◽  
Josephson Effect ◽  
Tunnel Junctions ◽  
Charge Density Waves ◽  
Density Waves ◽  
Quasiparticle Tunneling ◽  
Current Voltage

The tunnel junctions between superconductors where the Fermi surface (FS) is partially dielectrized are considered. The dielectrization due to Coulomb- and (or) electron-phonon interactions leads to the emergence of the dielectric gap Σ on nested FS sections and the existence of the charge-density waves below temperature T=T d . When T<T c <T d the partially-dielectrized metals become superconductors with a corresponding gap ∆. The voltage dependences of the nonstationary Josephson current and quasiparticle current are calculated for such junctions. The current-voltage (I–V) characteristics involve several Riedel-type singularities and jumps for voltages equal to definite combinations of gaps ∆ and Σ in the fermion excitation spectrum. So, I–V curves are much more complex than the ones for usual BCS-type superconductors. The results for quasiparticle tunneling agree with the experimental data available for oxides.

scholarly journals Josephson Effect in MgB2/Pd/Nb Trilayer Josephson Junctions

2021 ◽  
Vol 47 (3) ◽  
pp. 1062-1072
Author(s):  
Anayesu B Malisa
Keyword(s):  
Josephson Junctions ◽  
Josephson Effect ◽  
Molecular Beam ◽  
Bottom Electrode ◽  
Tunnel Junctions ◽  
Rf Sputtering ◽  
Ex Situ ◽  
Shapiro Steps ◽  
Josephson Tunnel ◽  
Junction Plane

This paper reports fabrication techniques and results of MgB2/Pd/Nb trilayer Josephson junctions. The MgB2 bottom electrode was co-evaporated by molecular beam epitaxy (MBE) technique from both magnesium and boron sources at a low substrate temperature ~ 300 °C, while the interlayer and the top niobium electrode (Pd/Nb bilayer) were deposited ex-situ using RF sputtering. The junctions exhibited  and  Josephson effect as well as a modulation of the critical current in a magnetic field applied in a direction normal to the junction plane. Fractional and integer Shapiro steps were observed at voltages corresponding to the frequency of the applied microwave radiation field. The  products of the junctions compare well with the previously reported values. The results suggest that it should be possible to fabricate all-MgB2 and MgB2 as one of the electrodes Superconductor/Normal/Superconductor (SNS), Superconductor/Insulator/Superconductor (SIS) or even Superconductor/Ferromagnet/Superconductor (SFS) tunnel junctions with interesting characteristics and for various applications. Keywords: MgB2; all-MgB2; Josephson Tunnel junctions; trilayer devices; Niobium

scholarly journals Эффекты близости и Джозефсона в бислоях из нитрида ниобия и алюминия

2019 ◽  
Vol 61 (9) ◽  
pp. 1594
Author(s):  
М.Ю. Левичев ◽  
А.И. Елькина ◽  
Н.Н. Бухаров ◽  
Ю.В. Петров ◽  
А.Ю. Аладышкин ◽  
...  
Keyword(s):  
Thin Films ◽  
Critical Current ◽  
Variable Thickness ◽  
Proximity Effect ◽  
Josephson Effect ◽  
High Ratio ◽  
Niobium Nitride ◽  
Magnetic Screening

The highly disordered thin films of niobium nitride and features of the manifestation of the proximity effect in the NbN (S) –Aluminium (N) bilayers with a high ratio of their specific resistances NbN / Al >> 1were investigated. It was shown that the magnetic screening and critical current Ic of such SN structures significantly increase compared with the S layer. The observed effect is associated with the appearance of induced superconductivity in the N layer due to the proximity effect. The Josephson effect was demonstrated in the variable thickness bridges NbN / Al - NbN - NbN / Al made from such SN bilayers.

New fabrication process for Josephson tunnel junctions with (niobium nitride, niobium) double‐layered electrodes

1982 ◽  
Vol 41 (11) ◽  
pp. 1097-1099 ◽  
Author(s):  
Akira Shoji ◽  
Fujitoshi Shinoki ◽  
Shin Kosaka ◽  
Masahiro Aoyagi ◽  
Hisao Hayakawa
Keyword(s):  
Tunnel Junctions ◽  
Niobium Nitride ◽  
Fabrication Process ◽  
Josephson Tunnel ◽  
Josephson Tunnel Junctions

Properties of niobium nitride-based Josephson tunnel junctions

Cryogenics ◽  
1984 ◽  
Vol 24 (1) ◽  
pp. 45-47 ◽  
Author(s):  
A.M. Cuculo ◽  
L. Maritato ◽  
A. Saggese ◽  
R. Vaglio
Keyword(s):  
Tunnel Junctions ◽  
Niobium Nitride ◽  
Josephson Tunnel ◽  
Josephson Tunnel Junctions

scholarly journals Spin Josephson effect in ferromagnet/ferromagnet tunnel junctions

2004 ◽  
Vol 67 (4) ◽  
pp. 620-626 ◽  
Author(s):  
F. S Nogueira ◽  
K.-H Bennemann
Keyword(s):  
Josephson Effect ◽  
Tunnel Junctions
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