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# IEEE Transactions on Applied Superconductivity

## Issue 3  Part 1 • June 2013

This issue contains several parts.Go to:  Part 2  | Part 3

## Filter Results

Displaying Results 1 - 25 of 175
• ### Front Cover

Publication Year: 2013, Article Sequence Number: 0001401
| PDF (93 KB)
• ### IEEE Transactions on Applied Superconductivity publication information

Publication Year: 2013, Article Sequence Number: 0001501
| PDF (135 KB)

Publication Year: 2013, Article Sequence Number: 0001608
| PDF (163 KB)
• ### ASC 2012 Introduction

Publication Year: 2013, Article Sequence Number: 0001301
Cited by:  Papers (1)
| PDF (27 KB) | HTML
• ### 2012 Conference Organization

Publication Year: 2013, Article Sequence Number: 0100106
| PDF (50 KB)
• ### The IEEE Council on Superconductivity Awards for Contributions in the Field of Applied Superconductivity (2012)

Publication Year: 2013, Article Sequence Number: 0200110
| PDF (490 KB)
• ### In Memoriam

Publication Year: 2013, Article Sequence Number: 0300101
| PDF (17 KB) | HTML
• ### Beyond the Helium Conundrum

Publication Year: 2013, Article Sequence Number: 0500113
Cited by:  Papers (7)
| | PDF (2627 KB) | HTML

Helium plays a central role in superconductivity. Despite breakthroughs in high-temperature superconducting materials, helium remains the coolant of choice. Against this there is concern about helium shortages. Global geological helium reserves are estimated to be approximately 8 million tons and are mainly in the U.S., Qatar, Algeria, and Russia. Annual helium production from natural gas runs at ... View full abstract»

• ### Temporal Stability of Y–Ba–Cu–O Nano Josephson Junctions from Ion Irradiation

Publication Year: 2013, Article Sequence Number: 1100103
Cited by:  Papers (5)
| | PDF (368 KB) | HTML

We investigate the temporal stability of YBa2Cu3 O7-δ Josephson junctions created by ion irradiation through a nanoscale implant mask fabricated using electron beam lithography and reactive ion etching. A comparison of current-voltage characteristics measured for junctions after fabrication and eight years of storage at room temperature show a slight decreas... View full abstract»

• ### SQUID Current Sensor With Differential Output

Publication Year: 2013, Article Sequence Number: 1100204
Cited by:  Papers (5)
| | PDF (339 KB) | HTML

We have developed a superconducting quantum interference device with differential output (diffSQUID). The device concept aims at improving the operability of SQUID current sensors in the presence of large common-mode signals. The diffSQUID is based on a series connection of two identical SQUID sensors. The biasing and input signal coupling provides for the differential output signal. The diffSQUID... View full abstract»

• ### Subgap Leakage in $hbox{Nb/Al}$ - $hbox{AlO}_{rm x}hbox{/Nb}$ Josephson Junctions and Run-to-Run Reproducibility: Effects of Oxidation Chamber and Film Stress

Publication Year: 2013, Article Sequence Number: 1100305
Cited by:  Papers (4)
| | PDF (485 KB) | HTML

Many applications of Nb/Al-AlOx/Nb Josephson junctions (JJs) in superconducting electronics require high-quality tunnel barriers with low subgap leakage that is usually characterized by figure of merit Vm = Ic Rsg, where Ic is the critical current and Rsg is the subgap resistance at 2 mV and 4.2 K. It is widely believed, and there i... View full abstract»

• ### Critical Current Density and Temperature Dependence of Nb-Al Oxide-Nb Junction Resistance and Implications for Room Temperature Characterization

Publication Year: 2013, Article Sequence Number: 1100405
Cited by:  Papers (1)
| | PDF (576 KB) | HTML

Room temperature junction resistance measurements are commonly used for screening Josephson-based circuits because testing is much easier than at cryogenic temperatures and can even be carried out at the wafer level. The value of ambient testing depends on the existence of a strong correspondence between the measured resistance at room temperature and the resistance and critical current obtained a... View full abstract»

• ### Sub-$muhbox{m}$ Josephson Junctions for Superconducting Quantum Devices

Publication Year: 2013, Article Sequence Number: 1100504
Cited by:  Papers (2)
| | PDF (531 KB) | HTML

For high-performance superconducting quantum devices based on Josephson junctions (JJs), decreasing lateral sizes is of great importance. Fabrication of sub-μm JJs is challenging, due to nonflat surfaces with step heights of up to several 100 nm generated during the fabrication process. We have refined a fabrication process with significantly decreased film thicknesses, resulting in almost ... View full abstract»

• ### Fabrication of Arrays of Nano-Superconducting Quantum Interference Devices Using a Double-Angle Processing Approach

Publication Year: 2013, Article Sequence Number: 1100604
Cited by:  Papers (1)
| | PDF (890 KB) | HTML

Arrays of superconducting quantum interference devices (SQUIDs) from high-temperature superconductors such as YBCO have been shown to significantly improve the signal-to-noise ratio when compared to single SQUIDs from high- TC material. This is based on the finding that the voltage response of a current biased array increases by the number of SQUID loops N, while the noise... View full abstract»

• ### Fabrication of $hbox{Nb/Al}_{2}hbox{O}_{3}/hbox{Nb}$ Josephson Junctions Using In Situ Magnetron Sputtering and Atomic Layer Deposition

Publication Year: 2013, Article Sequence Number: 1100705
Cited by:  Papers (3)
| | PDF (386 KB) | HTML

Atomic layer deposition (ALD) provides a promising approach for deposition of ultrathin low-defect-density tunnel barriers, and it has been implemented in a high-vacuum magnetron sputtering system for in situ deposition of ALD-Al2O3 tunnel barriers in superconductor-insulator-superconductor Josephson junctions. A smooth ALD-Al2O3 barrier layer was grown ... View full abstract»

• ### Design and Fabrication of All-NbN SFQ Circuits for SSPD Signal Processing

Publication Year: 2013, Article Sequence Number: 1100804
Cited by:  Papers (11)
| | PDF (289 KB) | HTML

We have developed an all-NbN integrated circuit technology for future integration of single flux quantum (SFQ) circuit with superconducting single-photon detector array. The all-NbN integrated circuits consist of epitaxial NbN/AlN/NbN tunnel junctions fabricated on single-crystal MgO substrates, Mo shunt resistors and 500-nm-thick NbN ground plane on the top. Critical current density and sheet res... View full abstract»

• ### Device Yield in Nb-Nine-Layer Circuit Fabrication Process

Publication Year: 2013, Article Sequence Number: 1100906
Cited by:  Papers (7)
| | PDF (1277 KB) | HTML

We are investigating device yield in our Nb-nine-layer fabrication process for single-flux-quantum (SFQ) circuits, in which the critical current density of the Nb/AlOx/ Nb Josephson junction (JJ) is 10 kA/cm2 and the minimum JJ size is 1 μm2. We fabricated several shift registers (SRs) with different sizes that exhibit bit capacities from 16 to 2560 bits on ... View full abstract»

• ### NbSi Barrier Junctions Tuned for Metrological Applications up to 70 GHz: 20 V Arrays for Programmable Josephson Voltage Standards

Publication Year: 2013, Article Sequence Number: 1101005
Cited by:  Papers (23)
| | PDF (572 KB) | HTML

PTB started using the robust NbxSi1-x barrier junction technology for the fabrication of large arrays for the Programmable Josephson Voltage Standard (PJVS) and for the Josephson Arbitrary Waveform Synthesizer 3 years ago. We demonstrate how Nb-doping of the amorphous Si barrier causes the transition from an underdamped to a desired overdamped junction behavior. Special dc SQ... View full abstract»

• ### Nano SNIS Junctions Fabricated by 3D FIB Sculpting for Application to Digital Electronics

Publication Year: 2013, Article Sequence Number: 1101104
Cited by:  Papers (13)
| | PDF (312 KB) | HTML

Overdamped Josephson junctions based on a Nb/Al-AlOx/Nb superconductor-normal metal-insulator-superconductor structure were realized at the submicrometer scale by using focused ion beam nano-sculpting technique. This approach represents an alternative solution to the classical electron beam lithography and allows for an accurate control of the junction dimensions. Superconductor-normal meta... View full abstract»

• ### Characterization of NbN Tunnel Junctions With Radical-Nitrided $hbox{AlN}_{rm x}$ Barriers

Publication Year: 2013, Article Sequence Number: 1101306
Cited by:  Papers (5)
| | PDF (1005 KB) | HTML

This paper reports on the electrical characteristics of NbN tunnel junctions fabricated by radical nitridation of an Al layer deposited on a base NbN layer to form the barrier. The NbN/Al-AlNx/NbN junction characteristics were improved by using NbN films with small surface roughness and by changing nitridation conditions. The junctions showed good critical current (Ic)... View full abstract»

• ### Probing the Nucleation of $hbox{Al}_{2}hbox{O}_{3}$ in Atomic Layer Deposition on Aluminum for Ultrathin Tunneling Barriers in Josephson Junctions

Publication Year: 2013, Article Sequence Number: 1101405
Cited by:  Papers (6)
| | PDF (370 KB) | HTML

Ultrathin dielectric tunneling barriers are critical to Josephson junction (JJ) based superconducting quantum bits (qubits). However, the prevailing technique of thermally oxidizing aluminum via oxygen diffusion produces problematic defects, such as oxygen vacancies, which are believed to be a primary source of the two-level fluctuators and contribute to the decoherence of the qubits. Development ... View full abstract»

• ### Improved Nanopatterning for YBCO Nanowires Approaching the Depairing Current

Publication Year: 2013, Article Sequence Number: 1101505
Cited by:  Papers (17)
| | PDF (613 KB) | HTML

An improved nanopatterning procedure has been developed to obtain YBa2Cu3O7-x nanowires with cross-sections as small as 50 × 50 nm2, protected by an Au capping layer. To probe the effective role of the Au protecting layer, we have measured the current-voltage characteristics and the resistive transition in temperature of the nanowires. Critical cu... View full abstract»

• ### Experimental Study of Superconducting Electronic Multichip Modules Packaged Using Carbon Nanotube (CNT) Based Polymer Underfill

Publication Year: 2013, Article Sequence Number: 1200105
| | PDF (776 KB) | HTML

We report on the experimental study of flip chip bonded niobium-based superconducting multichip module (MCM) using a nano-engineered cryogenic adhesive (nECA) for a cryogenic underfill that uses single-wall carbon nanotubes. Two MCMs, each having a 5 × 5 mm2 chip flip chip bonded onto a 1 × 1 cm2 carrier chip, were made with the nECA and pure cryogenic underfill... View full abstract»

• ### 20-GHz 8 x 8-bit Parallel Carry-Save Pipelined RSFQ Multiplier

Publication Year: 2013, Article Sequence Number: 1300104
Cited by:  Papers (9)
| | PDF (475 KB) | HTML

We will discuss the microarchitecture, design, and testing of the first 8 × 8-bit (by modulo 256) parallel carry-save RSFQ multiplier implemented using the ISTEC 10- kA/cm2 1.0-μm fabrication technology. Partial products are asynchronously generated and sent to the reduction stage at the internal “hardwired” rate of 80 GHz. The 8 &times; 8-bit RSFQ multip... View full abstract»

• ### Status of Superconductor Electronic Circuit Design Software

Publication Year: 2013, Article Sequence Number: 1300205
Cited by:  Papers (14)  |  Patents (1)
| | PDF (264 KB) | HTML

More than a decade has elapsed since the publication of the last thorough evaluation of the global state of superconductor electronic (SCE) design software, and seven years since the publication of the 2005 SCENET roadmap. In this work we discuss the progress made to date on SCE design software, present a critical analysis of the capabilities of the software available today, and attempt to lay the... View full abstract»

## Aims & Scope

IEEE Transactions on Applied Superconductivity contains articles on the applications of superconductivity and other relevant technology.

Full Aims & Scope

## Meet Our Editors

Editor-in-Chief
Britton L. T. Plourde
Syracuse University
bplourde@syr.edu
http://asfaculty.syr.edu/pages/phy/plourde-britton.html