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Most published Xplore authors for Superconductive Tunneling

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Xplore Articles related to Superconductive Tunneling

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Superconductive 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 plasma-induced 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 density-of-states model it ...


Superconductive tunneling

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 single-particle 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

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IEEE-USA E-Books

  • 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 plasma-induced 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 crossed-film 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 arrayed-device design. A cautiously optimistic review of the state-of-the-art 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 density-of-states 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.

  • Superconductive tunneling

    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 single-particle 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 small-signal 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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