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Search Publications by: Paul Dresselhaus (Fed)

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Displaying 251 - 275 of 345

Cosputtered Amorphous Nb_xSi_1-x Barriers for Josephson-Junction Circuits

December 1, 2006
Author(s)
Burm Baek, Paul D. Dresselhaus, Samuel P. Benz
Cosputtered Amorphous NbxSi1-x has been developed as a barrier material for Josephson junction array circuits. This material is not only promising as a normal-metal barrier for state-of-the-art Josephson voltage standard circuits, but the capability of

Lumped 50 Ohm Arrays of SNS Josephson Junctions

December 1, 2006
Author(s)
Nicolas Hadacek, Paul Dresselhaus, Samuel Benz
For the first time lumped series arrays of Josephson junctions have been fabricated with a transmission line-matched 50 Ohm nresistance and having the thousands of junctions necessary to produce a metrologically significant voltage. Using such arrays we

100 mV ac-dc Transfer Standard measurements with a Pulse-driven AC Josephson Voltage Standard

July 14, 2006
Author(s)
Samuel P. Benz, Charles J. Burroughs, Paul D. Dresselhaus, Thomas E. Lipe, Joseph R. Kinard Jr.
In order to improve the low-voltage calibration service at NIST we have constructed an ac Josephson voltage standard system with a maximum rms output voltage of 100 mV. Using this system we synthesized sinewaves of various audio frequencies and measured ac

Development of a 60 Hz Power Standard using SNS Programmable Josephson Voltage Standards

July 14, 2006
Author(s)
Charles J. Burroughs, Samuel Benz, Paul Dresselhaus, Yonuk Chong, Bryan C. Waltrip, Thomas L. Nelson, J. Williams
We are implementing a new standard for 60 Hz mains power based on precision sinusoidal reference voltages from two independent Programmable Josephson Voltage Standards (PJVS) (one for voltage and one for current). Our NIST PJVS systems are based on

100 mV AC-DC Transfer Standard Measurements Using An AC Josephson Voltage Standard

June 1, 2006
Author(s)
Charles J. Burroughs, Samuel Benz, Paul Dresselhaus
NIST is implementing the Josephson arbitrary waveform synthesizer as an ac Josephson Voltage Standard (ACJVS). Over the past few years we have demonstrated precision measurements of synthesized sine waves at rms voltage amplitudes up to 170 mV. The system

Resonance-free Low-pass Filters for the ac Josephson Voltage Standard

March 1, 2006
Author(s)
Michio Watanabe, Paul Dresselhaus, Samuel Benz
We have designed and characterized superconducting integrated circuits for the ac Josephson voltage standard that demonstrate significantly improved performance. The typical circuit consists of an array of superconductor-normal metal-superconductor

Josephson junctions with nearly superconducting metal silicide barriers

November 23, 2005
Author(s)
Yonuk Chong, Nicolas Hadacek, Paul Dresselhaus, Charles J. Burroughs, Burm Baek, Samuel Benz
We present a detailed study of the electrical properties of Nb-based planar Josephson junctions with superconducting metal silicide barriers, TiSi2 and WSi2. While these non-hysteretic junctions are useful for voltage standard applications, they are also

Progress Toward Practical AC and DC Josephson Voltage Standards at NIST

September 21, 2005
Author(s)
Samuel Benz, Charles J. Burroughs, Paul Dresselhaus, Nicolas Hadacek, Yonuk Chong
For the past 10 years NIST has been developing the next generation of voltage standard systems based on arrays of normal-metal barrier Josephson junctions. We have developed stable, programmable dc standards capable of providing intrinsically stable

Silicide Barrier SNS Junctions for AC Josephson Voltage Standards

September 5, 2005
Author(s)
Paul Dresselhaus, Yonuk Chong, Nicolas Hadacek, Burm Baek, Michio Watanabe, Charles J. Burroughs, Samuel Benz
We have used MoSi2 barrier superconductor-normal-metal-superconductor (SNS) double stacked junctions to generate audio frequency ac waveforms with metrological accuracy. Circuits used in this experiment were two parallel arrays of 1280 stacks of 2

Electrical Properties of Nb-MoSi2-Nb Josephson Junctions

June 6, 2005
Author(s)
Yonuk Chong, Paul Dresselhaus, Samuel Benz
We present a detailed study of the electrical properties of planar Nb-MoSi2-Nb Josephson junctions. The Nb-MoSi2-Nb junction is an excellent system to study proximity-coupling in junctions with rigid superconductor/normal metal boundaries by controlling

Fabrication and Measurement of Tall Stacked Arrays of SNS Josephson Junctions

June 1, 2005
Author(s)
Nicolas Hadacek, Paul Dresselhaus, Yonuk Chong, Samuel Benz, John E. Bonevich
We have made tall, uniform stacked Josephson junction arrays by developing an etch process using an inductively coupled plasma etcher. This process produces vertical profiles in thin-film multilayers of alternating superconducting and normal metals. Such a