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Related Experiment Video

Updated: Jan 6, 2026

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

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Published on: August 2, 2019

Niobium-titanium (Nb-Ti) superconducting joints for persistent-mode operation.

Dipak Patel^1,2, Su-Hun Kim^1,3, Wenbin Qiu¹

¹Institute for Superconducting and Electronic Materials, Australian Institute for Innovative Materials, University of Wollongong, North Wollongong, New South Wales, 2500, Australia.

Scientific Reports

|October 5, 2019

Summary

New niobium-titanium (Nb-Ti) superconducting joints were developed for stable magnetic fields. These joints demonstrate high critical current and ultra-low resistance, enabling practical persistent-mode operation in superconducting magnets.

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Fabrication and Characterization of Superconducting Resonators

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Published on: May 21, 2016

Area of Science:

Materials Science
Condensed Matter Physics
Electrical Engineering

Background:

Superconducting joints are critical for persistent-mode operation in superconducting magnet systems.
Ultra-stable magnetic fields are required for various scientific and technological applications.

Purpose of the Study:

To design and evaluate novel niobium-titanium (Nb-Ti) superconducting joints.
To achieve high critical current and low resistance for practical applications.

Main Methods:

Fabrication of superconducting joints using a solder matrix replacement method.
Utilized two types of lead-bismuth (Pb-Bi) solder, including a new Pb42Bi58 composition.
Tested joints in a closed-loop coil and demonstrated persistent-mode operation in an Nb-Ti solenoid coil.

Main Results:

All fabricated Nb-Ti joints achieved a critical current exceeding 200 A below 1.43 T at 4.2 K.
The optimized joining method resulted in a total circuit resistance of 3.25 × 10⁻¹⁴ Ω at 4.2 K in self-field.
Successful demonstration of persistent-mode operation with a persistent-current switch.

Conclusions:

The developed Nb-Ti superconducting joints meet the stringent requirements for persistent-mode operation.
The solder matrix replacement method is effective for fabricating high-performance superconducting joints.
This work facilitates the development of advanced superconducting magnet systems.