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Current-Phase Relations of Superconducting PtSi Constriction Josephson Junctions
Tharanga R Nanayakkara1,2, Anthony T Bollinger3, Kevin Musick4
1Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, United States.
Nano Letters
|January 6, 2026
Summary
Researchers studied nonlinear current-phase relations in platinum silicide Josephson junctions. Device lead inductance moderates nonlinearity, impacting superconducting circuit design.
Area of Science:
- Condensed Matter Physics
- Superconductivity
- Materials Science
Background:
- Josephson junctions are fundamental to superconducting electronics.
- Understanding their current-phase relations is crucial for device performance.
- Platinum silicide offers unique properties for superconducting applications.
Purpose of the Study:
- To investigate the current-phase relations of superconductor-constriction-superconductor Josephson junctions.
- To quantify the nonlinearity in these junctions fabricated from platinum silicide.
- To assess the impact of device lead inductance on junction nonlinearity.
Main Methods:
- Fabrication of dc-superconducting quantum interference devices (SQUIDs) with platinum silicide Josephson junctions.
- Measurement of magnetic-field-dependent electrical transport.
- Numerical simulations using the Ginzburg-Landau theory for comparison.
Main Results:
- Extracted current-phase relations for individual Josephson junctions.
- Quantified the degree of nonlinearity within the junctions.
- Observed that device lead kinetic inductance moderates the nonlinearity of the constrictions.
Conclusions:
- Platinum silicide Josephson junctions exhibit significant nonlinearity.
- Kinetic inductance of device leads plays a key role in modulating this nonlinearity.
- These findings are critical for the practical design of superconducting circuits.
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