IEEE Organizations related to Superconductor Junctions

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Conferences related to Superconductor Junctions

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Periodicals related to Superconductor Junctions

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Most published Xplore authors for Superconductor Junctions

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Xplore Articles related to Superconductor Junctions

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Theoretical Study of Point-Contact Andreev Reflection Spectroscopy for Ferromagnetic Metal/Insulator/D-Wave Superconductor Junctions

IEEE Transactions on Magnetics, 2012

This paper theoretically analyzed Andreev reflection in the ferromagnetic metal/insulator/d-wave superconductor junctions using the Bogoliubov-de Gennes equations. We calculated the total tunneling conductance spectra and found that the conductance suppression due to the insulator depends on the relation between the exchange energy and the Fermi wave number difference. Our results showed the feasibility of the spin polarization measurement with high-_T_c ...


Superconductor-normal metal-superconductor junctions for signal amplification and harmonic multiplication

IEEE Transactions on Magnetics, 1999

We report signal amplification and harmonic multiplication processes based on the nonlinear current-voltage characteristics (CVC) displayed by superconductor-normal metal-superconductor (SNS) junctions. Such junctions may exhibit a negative differential resistance at low voltages, the so called low- voltage-negative-differential-resistance (LVNDR) effect. This effect is due to the quantum mechanical multiple Andreev reflection mechanism in very clean systems and is stable against a ...


Superconductor-normal metal-superconductor junctions for signal amplification and harmonic multiplication

1999 IEEE International Magnetics Conference (INTERMAG), 1999

None


High-T/sub c/ superconductor-normal-superconductor junctions with polyimide-passivated ambient-temperature edge formation

IEEE Transactions on Applied Superconductivity, 1997

Superconductor-Normal-Superconductor (SNS) edge Josephson Junctions (JJs) continue to be a focus of high-T/sub c/ superconductor (HTS) electronics development. The ability to form clean edges in HTS materials is essential for successful SNS edge JJs as well as crossovers and via contacts. We report a novel SNS JJ fabrication process in which a YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta///SrTiO/sub 3/ base electrode/insulator ...


A track-and-hold circuit based on the nonlinear quasiparticle conductance of superconductor-insulator-superconductor junctions

IEEE Transactions on Applied Superconductivity, 1993

A new high-speed track-and-hold circuit is proposed and demonstrated. The current in a large inductor follows the instantaneous signal in the track mode and is nearly stationary in the hold mode. Control of track or hold mode is by means of lateral, balanced injection through a bridge of superconductor- insulator-superconductor (SIS) junctions. The high resistance subgap state is used for ...


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Educational Resources on Superconductor Junctions

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IEEE.tv Videos

ASC-2014 SQUIDs 50th Anniversary: 1 of 6 Arnold Silver
Superconductive Energy-Efficient Computing - ASC-2014 Plenary-series - 6 of 13 - Wednesday 2014/8/13
One HTS Josephson Junction, An Array of Applications: Has anything come from HTS devices in the last 30 years?
Stochastic Single Flux Quantum Neuromorphic Computing using Magnetically Tunable Josephson Junctions - Stephen Russek: 2016 International Conference on Rebooting Computing
IRDS: IFT Cryogenic Electronics & Quantum Information Processing - Scott Holmes at INC 2019
The Josephson Effect: The Original SQUIDs
Erasing Logic-Memory Boundaries in Superconductor Electronics - Vasili Semenov: 2016 International Conference on Rebooting Computing
The Josephson Effect: The Observations of Josephson's Effects
IMS 2015: Jonas Zmuidzinas - John Tucker Special Tribute - The High-Frequency Limits of SIS Receivers
30 Years to High Temperature Superconductivity (HTS): Status and Perspectives
The Prospects for Scalable Quantum Computing with Superconducting Circuits - Applied Superconductivity Conference 2018
Electronic Systems for Quantum Computation - David DiVincenzo: 2016 International Conference on Rebooting Computing
Recent Research Activities of Applied Superconductivity in China
Unconventional Superconductivity: From History to Mystery
Superconductors for the Future from the Perspective of the Past
ISEC 2013 Special Gordon Donaldson Session: Remembering Gordon Donaldson - 6 of 7 - A high sensitive magnetometer system for natural magnetic field measurements
The Josephson Effect: SQUIDs Then and Now: From SLUGS to Axions
Cryogenics for Applied Superconductivity - ASC-2014 Plenary series - 11 of 13 - Friday 2014/8/15
The Josephson Effect: The Josephson Volt
ISEC 2013 Special Gordon Donaldson Session: Remembering Gordon Donaldson - 1 of 7 - Gordon Donaldson: A Memory - part I - John Clarke

IEEE-USA E-Books

  • Theoretical Study of Point-Contact Andreev Reflection Spectroscopy for Ferromagnetic Metal/Insulator/D-Wave Superconductor Junctions

    This paper theoretically analyzed Andreev reflection in the ferromagnetic metal/insulator/d-wave superconductor junctions using the Bogoliubov-de Gennes equations. We calculated the total tunneling conductance spectra and found that the conductance suppression due to the insulator depends on the relation between the exchange energy and the Fermi wave number difference. Our results showed the feasibility of the spin polarization measurement with high-_T_c superconductivity using the same system of the Point-contact Andreev reflection (PCAR) measurement.

  • Superconductor-normal metal-superconductor junctions for signal amplification and harmonic multiplication

    We report signal amplification and harmonic multiplication processes based on the nonlinear current-voltage characteristics (CVC) displayed by superconductor-normal metal-superconductor (SNS) junctions. Such junctions may exhibit a negative differential resistance at low voltages, the so called low- voltage-negative-differential-resistance (LVNDR) effect. This effect is due to the quantum mechanical multiple Andreev reflection mechanism in very clean systems and is stable against a bias voltage. Therefore, it is in principle possible to use these junctions as an active element in a variety of circuit applications such as oscillators, amplifiers or mixers, in the microwave and millimeter-wave range.

  • Superconductor-normal metal-superconductor junctions for signal amplification and harmonic multiplication

    None

  • High-T/sub c/ superconductor-normal-superconductor junctions with polyimide-passivated ambient-temperature edge formation

    Superconductor-Normal-Superconductor (SNS) edge Josephson Junctions (JJs) continue to be a focus of high-T/sub c/ superconductor (HTS) electronics development. The ability to form clean edges in HTS materials is essential for successful SNS edge JJs as well as crossovers and via contacts. We report a novel SNS JJ fabrication process in which a YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta///SrTiO/sub 3/ base electrode/insulator bilayer coated with a polyimide passivation layer is rotated during Ar ion milling through a reflowed photoresist mask to form omnidirectional edges. No sample cooling is used during milling. YBa/sub 2/Cu/sub 2.8/Co/sub 0.2/O/sub 7-/spl delta// normal layers and YLa/sub 0.05/Ba/sub 2/Cu/sub 3/O/sub 7-/spl delta// counter- electrodes completed the SNS JJ's. Devices fabricated using this polyimide passivation layer have significantly smaller spreads in critical current and resistance than those processed without it.

  • A track-and-hold circuit based on the nonlinear quasiparticle conductance of superconductor-insulator-superconductor junctions

    A new high-speed track-and-hold circuit is proposed and demonstrated. The current in a large inductor follows the instantaneous signal in the track mode and is nearly stationary in the hold mode. Control of track or hold mode is by means of lateral, balanced injection through a bridge of superconductor- insulator-superconductor (SIS) junctions. The high resistance subgap state is used for tracking and the low differential resistance at the energy gap is used for holding. Experimental results using a 6 GHz clock and signal frequencies up to 3.2 GHz are reported.<>

  • Experiments on YBCO tape type high temperature superconductor junctions

    This paper is concerned with the study of electrical contacts between the components used in building key parts of high temperature superconducting (HTS) electromagnets, e.g., HTS coils, HTS current leads, etc. Some preliminary tests on two types of junctions are presented, Cu - HTS and HTS - HTS, and some details of their manufacturing process are shown. Experimental and numerical results on the electrical resistances of these junctions may provide for a basis analysis of selection for appropriate solutions under specific working circumstances. Of particular concern is the experimental setup used to measure the electrical resistances of the junctions. A Gifford - McMahon Cryo-Cooler (GM-CC) conditioned cryo-environment provides adequate experimental conditions to the study. The paper presents numerical simulation results of the electrokinetic model for the electrical current flow within the junctions too, aiming at computing their electrical resistances, the magnetic field produced by the current flowing through the junctions with the aim to asses the background magnetic field that might affect the measurements, and the heat transfer to the ambient, to ascertain the efficiency of the cryo- system used in the experiments.

  • Charge Transport in Hybrid Tunnel Superconductor—Quantum Dot—Superconductor Junctions

    We have studied thin-film superconductor - semiconductor (with quantum dots)-superconductor MoRe-Si(W)-MoRe junctions, where electrons are tunneling through a single or several quantum dots within the Si(W) barrier. Current- voltage characteristics (CVCs) of the samples have been measured in a wide voltage range from -900 to 900 mV at temperatures from 4.2 to 8 K. At relatively high tungsten content in the barrier, we have observed emergence of the Josephson effect. Characteristic voltages IcRN, the product of the critical Josephson supercurrent Ic and the normal-state resistance RN, of the samples were unusually high. Simultaneously, we have observed large excess quasiparticle currents Iexc in the dissipative part of CVCs, which is a strong evidence of intensive electron-to-hole Andreev reflections in the junctions studied. When the W content in the barrier was decreased, the Josephson current disappeared, and we have observed resonant current peaks in the CVCs at bias voltages from 40 to 300 mV, which were symmetrical for positive and negative voltages. In the studied heterostructures, metal clusters inside the barrier behave as quasi-one-dimensional quantum dots; hence, the charge transport can be adequately described by scattering matrices within the quantum model of one-dimensional charge transport.

  • Characterisation of binary Josephson series arrays of different types at BNM-LNE and comparisons with conventional SIS arrays

    Three 1 V binary Josephson arrays developed by the NIST, the PTB and the VTT and using respectively SNS (superconductor-normal-superconductor), SINIS (superconductor-insulator-normal-insulator-superconductor) and externally shunted SIS (superconductor-insulator-superconductor) junctions have been tested at BNM-LNE. Preliminary results of direct comparisons with conventional SIS arrays globally show a good agreement of less than 0.5 nV, at any nominal voltages between 41 mV and 1.3 V.

  • Evaluation of Interface Resistance in a REBCO Tape at Different Temperatures by Contact-Probing Current Transfer Length Method

    The multi-layered structure of a rare-earth barium copper oxide (REBCO) tape causes the resistance of Cu/Ag and Ag/REBCO interfaces (interface resistance), which is a major factor of the resistance of tape-to-tape joints (joint resistance). Interface resistance has been evaluated by the current transfer length (CTL) method. However, induced damage of a part of the measured REBCO tape in this method may cause variations in estimated values, as well as making the tape itself unable to be reused for applications. Therefore, this study proposes the contact-probing CTL method, which is a nondestructive evaluation method of interface resistance. We evaluated the interface resistance in a REBCO tape by the conventional CTL method and the contact- probing CTL method. The estimated interface resistance values by the contact- probing CTL method were more reliable and less varied than those by the conventional method. We also evaluated the temperature dependence of the interface resistance, which is important to analyze joint resistance for various applications of REBCO tapes. The result showed that the interface resistance remained constant at different temperatures.

  • Design and Performance of Sideband Separating SIS Mixer for 800-950 GHz

    We present the design and results of characterisation of a new sideband separating (2SB) mixer for 800–950 GHz, based on superconductor-insulator- superconductor (SIS) junctions. This is the first waveguide 2SB SIS mixer demonstrated at such a high frequency. The design is following the classical quadrature hybrid architecture, meanwhile additional attention was put on the reduction of reflections in the RF structure in order to minimise the RF imbalance, to achieve a high image rejection ratio (IRR). The RF waveguide block was manufactured by micro-milling and populated by single-ended SIS mixers developed earlier for upgrade of the CHAMP+ high band array on the APEX telescope. These SIS mixers have DSB noise temperatures from 210 to 400 K. The assembled 2SB mixer yields a single-sideband noise temperature from 450 to 900 K, with an image rejection ratio above 15dB in 95% of the band. Comparing the DSB and SSB sensitivities, we find that the waveguide losses are as low as expected and do not exceed 0.6 dB. The presented mixer is a prototype for use in a 2SB dual polarisation receiver planned for deployment on the APEX telescope.



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