Superconductive Tunneling
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Xplore Articles related to Superconductive Tunneling
Back to TopSuperconductive tunneling devices as millimeter wave photon detectors
IEEE Transactions on Magnetics, 1979
A quantum generalization of microwave mixer theory predicts that superconductive tunneling devices may be employed as ultrasensitive low noise photon detectors at millimeter wave frequencies.
Superconductive tunneling device characteristics for array application
IEEE Transactions on Magnetics, 1968
Experimental data are presented for superconductive tunneling devices (STD) of varied geometrical design. The devices exhibited stable characteristics since they were formed by plasmainduced oxidation of Pb films in conjunction with existent array fabrication technology previously developed for cryotrons. The dependence of the tunneling supercurrent has been measured as a function of barrier perimeter and applied magnetic field. This field ...
Superconductive tunneling into Nb3Sn with barriers formed by RF oxidation
IEEE Transactions on Magnetics, 1981
Thin film tunnel junctions were fabricated using rf oxidation of sputtered Nb3Sn films and subsequent evaporation of Pb. Very little control of junction impedance could be obtained from variation of the rf voltage or the partial pressure of oxygen. Small Josephson currents and high leakage in the quasi particle characteristics were observed. Using an approximate proximity effect densityofstates model it ...
Proceedings of the IEEE, 1964
This paper reviews briefly the tunneling mechanisms through a thin insulating barrier between two metals and mentions some device applications based on these mechanisms. Three different cases are described: tunneling between metals both in the normal (nonsuperconductive) state, tunneling between them when one or both are superconductive, and Josephson tunneling through a very thin barrier between superconductors.
Quantum limited detection in tunnel junction mixers
IEEE Journal of Quantum Electronics, 1979
A complete quantum generalization of microwave mixer theory is constructed for nonlinear singleparticle tunnel junctions. The result represents a unification of the concepts used to describe these "classical" resistive mixers with the language of photon detection. Tunneling devices are predicted to undergo a transition from energy detectors to photon counters when operated at frequencies where the photon energy becomes comparable ...
Educational Resources on Superconductive Tunneling
Back to TopIEEE.tv Videos
Voltage Metrology with Superconductive Electronics
Superconductive EnergyEfficient Computing  ASC2014 Plenaryseries  6 of 13  Wednesday 2014/8/13
ASC2014 SQUIDs 50th Anniversary: 3 of 6  Bob Fagaly
The Josephson Effect: The Observations of Josephson's Effects
Materials Challenges for NextGeneration, HighDensity Magnetic Recording  Kazuhiro Hono: IEEE Magnetics Distinguished Lecture 2016
IEEEUSA EBooks

Superconductive tunneling devices as millimeter wave photon detectors
A quantum generalization of microwave mixer theory predicts that superconductive tunneling devices may be employed as ultrasensitive low noise photon detectors at millimeter wave frequencies.

Superconductive tunneling device characteristics for array application
Experimental data are presented for superconductive tunneling devices (STD) of varied geometrical design. The devices exhibited stable characteristics since they were formed by plasmainduced oxidation of Pb films in conjunction with existent array fabrication technology previously developed for cryotrons. The dependence of the tunneling supercurrent has been measured as a function of barrier perimeter and applied magnetic field. This field is generated by in line and crossedfilm control layers matched to the geometrical dimensions of the barriers. Control of device geometry is shown to yield the unbiased current gain desired for logic and memory applications. The results reported form an empirical basis for arrayeddevice design. A cautiously optimistic review of the stateoftheart in STD technology is included.

Superconductive tunneling into Nb3Sn with barriers formed by RF oxidation
Thin film tunnel junctions were fabricated using rf oxidation of sputtered Nb3Sn films and subsequent evaporation of Pb. Very little control of junction impedance could be obtained from variation of the rf voltage or the partial pressure of oxygen. Small Josephson currents and high leakage in the quasi particle characteristics were observed. Using an approximate proximity effect densityofstates model it appears that a damaged surface layer causes a reduced energy gap with a value somewhat dependent on the oxidation process. Two types of characteristics were observed and can be explained by the existence of two metallic phases in some of the films.

This paper reviews briefly the tunneling mechanisms through a thin insulating barrier between two metals and mentions some device applications based on these mechanisms. Three different cases are described: tunneling between metals both in the normal (nonsuperconductive) state, tunneling between them when one or both are superconductive, and Josephson tunneling through a very thin barrier between superconductors.

Quantum limited detection in tunnel junction mixers
A complete quantum generalization of microwave mixer theory is constructed for nonlinear singleparticle tunnel junctions. The result represents a unification of the concepts used to describe these "classical" resistive mixers with the language of photon detection. Tunneling devices are predicted to undergo a transition from energy detectors to photon counters when operated at frequencies where the photon energy becomes comparable to the voltage scale of the dc nonlinearity. The smallsignal video current response is found to approach one electron for each photon absorbed at high frequencies. In a heterodyne receiver, sufficiently nonlinear tunnel junctions are predicted to be capable of achieving the fundamental quantum noise limit for sensitivity in the detection of electromagnetic radiation. The theory presented here thus provides a framework for systematically extending the techniques of quantum electronics to considerably lower frequencies than are currently being exploited. Recent measurements of heterodyne mixer performance using superconductive tunneling devices are already beginning to approach quantum limited results at microwave and millimeter wave frequencies. Eventual application of tunnel barriers as photon detectors in the submillimeter and infrared spectral regions also appears to be possible, and the fast response times of such devices could give them an advantage over photoconductors even at the higher frequencies. The development of suitable nonlinear tunnel junctions contains the potential to bridge the present gap in quantum detectors between the infrared photon devices and microwave masers.
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