Double-barrier Josephson junctions: theory and experiment

Brinkman, Alexander; Cassel, D.; Golubov, A. A.; Kupriyanov, M. Yu.; Siegel, M.; Rogalla, Horst

doi:10.1109/77.919551

Cited by 12 publications

(9 citation statements)

References 15 publications

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“…2001;Hagedorn et al, 2001Hagedorn et al, , 2002Kaul and van Duzer, 2001;Ohta et al, 2001;Schubert et al, 2001; van Duzer et al, 2002. 5 See Amin et al, 1992;Nevirkovets, 1995Nevirkovets, , 1997Capogna and Blamire, 1996;Nevirkovets et al, 1996Capogna et al, 1997;Maezawa and Shoji, 1997;Sugiyama et al, 1997Sugiyama et al, , 1999Balashov et al, 1998Balashov et al, , 1999Balashov et al, , 2001Schulze et al, 1998Behr et al, 1999;Buchholz and Kessel, 1999;Brinkman et al, 1999Brinkman et al, , 2001Khabipov et al, 1999Khabipov et al, , 2002aKhabipov et al, , 2002bKupriyanov et al, 1999;Buchholz et al, 2001;Cassel et al, 2001;Kohlmann et al, 2001Kohlmann et al, , 2002Nevirkovets, Ketterson, and Rowell, 2001;Nevirkovets, Ketterson, and Siegel, 2001;Shaternik et al, 2001;Kieler et al, 2002;Nevirkovets and Ketterson, 2002;Yamamori et al, 2002;Tolpygo, Brinkman, et al, 2003. between the S electrodes. Until now, only a planar geometry has been realized in experiments by…”

Section: B Basic Josephson Structuresmentioning

confidence: 99%

The current-phase relation in Josephson junctions

Golubov

Kupriyanov

Il’ichev³

2004

Rev. Mod. Phys.

1,337

1,362

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This review provides a theoretical basis for understanding the current-phase relation (C⌽R) for the stationary (dc) Josephson effect in various types of superconducting junctions. The authors summarize recent theoretical developments with an emphasis on the fundamental physical mechanisms of the deviations of the C⌽R from the standard sinusoidal form. A new experimental tool for measuring the C⌽R is described and its practical applications are discussed. The method allows one to measure the electrical currents in Josephson junctions with a small coupling energy as compared to the thermal energy. A number of examples illustrate the importance of the C⌽R measurements for both fundamental physics and applications.

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Section: B Basic Josephson Structuresmentioning

confidence: 99%

The current-phase relation in Josephson junctions

Golubov

Kupriyanov

Il’ichev³

2004

Rev. Mod. Phys.

1,337

1,362

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“…Since complex circuits require the uniformity of junctions, this scaling strategy is practically limited to the junction size of a few tenths of a micron. Double-barrier, S-I -N -I -S, Josephson structures were proposed to mitigate the difficulties of the scaling [18,19]. If the N -layer thickness, d N , is much smaller then the decay length,…”

Section: Scalability Of Josephson Junctionsmentioning

confidence: 99%

Miniaturization of Josephson Junctions for Digital Superconducting Circuits

et al. 2021

Self Cite

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In this work, we briefly overview various options for Josephson junctions, which should be scalable down to nanometer range for utilization in nanoscale digital superconducting technology. Such junctions should possess high values of critical current, I c , and normal state resistance, R N . Another requirement is the high reproducibility of the junction parameters across a wafer in a fabrication process. We argue that superconductor-normal metal-superconductor (SN -N -NS) Josephson junction of "variable thickness bridge" geometry is a promising choice to meet these requirements. Theoretical analysis of the SN -N -NS junction is performed in the case where the distance between the S electrodes is comparable to the coherence length of the N material. The restriction on the junction geometrical parameters providing the existence of superconductivity in the S electrodes is derived for the current flowing through the junction of an order of I c . The junction heating, as well as available mechanisms for the heat removal, is analyzed. The obtained results show that a SN -N -NS junction with a high (submillivolt) value of I c R N product can be fabricated from a broadly utilized combination of materials like Nb/Cu using well-established technological processes. The junction area can be scaled down to that of semiconductor transistors fabricated in the frame of a 40-nm process.

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“…Several methods for the fabrication of shunted JJs have been developed. These methods include the use of double-barrier junctions with an additional normal layer between two conventional JJs [17,18] and Nb/αSi/Nb structures with a doped Si layer [19]. However, the most widely used and best-developed method involves the use of Nb/Al-AlO x /Nb tunnel junctions [20,21] with an additional external resistive shunt made from Mo (Figure 1).…”

Section: Low-tc Vs High-tc Jjs and DC Squids: Technologies And Prmentioning

confidence: 99%

Superconducting Quantum Interferometers for Nondestructive Evaluation

Faley

Kostyurina

Kalashnikov

et al. 2017

Sensors

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We review stationary and mobile systems that are used for the nondestructive evaluation of room temperature objects and are based on superconducting quantum interference devices (SQUIDs). The systems are optimized for samples whose dimensions are between 10 micrometers and several meters. Stray magnetic fields from small samples (10 µm–10 cm) are studied using a SQUID microscope equipped with a magnetic flux antenna, which is fed through the walls of liquid nitrogen cryostat and a hole in the SQUID’s pick-up loop and returned sidewards from the SQUID back to the sample. The SQUID microscope does not disturb the magnetization of the sample during image recording due to the decoupling of the magnetic flux antenna from the modulation and feedback coil. For larger samples, we use a hand-held mobile liquid nitrogen minicryostat with a first order planar gradiometric SQUID sensor. Low-Tc DC SQUID systems that are designed for NDE measurements of bio-objects are able to operate with sufficient resolution in a magnetically unshielded environment. High-Tc DC SQUID magnetometers that are operated in a magnetic shield demonstrate a magnetic field resolution of ~4 fT/√Hz at 77 K. This sensitivity is improved to ~2 fT/√Hz at 77 K by using a soft magnetic flux antenna.

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Double-barrier Josephson junctions: theory and experiment

Cited by 12 publications

References 15 publications

The current-phase relation in Josephson junctions

The current-phase relation in Josephson junctions

Miniaturization of Josephson Junctions for Digital Superconducting Circuits

Superconducting Quantum Interferometers for Nondestructive Evaluation

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