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Evidence for nonlocal electrodynamics in planar Josephson junctions.

A A Boris¹, A Rydh, T Golod

¹Department of Physics, AlbaNova University Center, Stockholm University, SE-106 91 Stockholm, Sweden.

Physical Review Letters

|October 1, 2013

Summary

We investigated Josephson junctions and found their behavior changes with temperature. At higher temperatures, they exhibit nonlocal electrodynamics, deviating from conventional models.

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Area of Science:

Superconductivity
Condensed Matter Physics
Materials Science

Background:

Josephson junctions are crucial for superconducting electronics.
Understanding their temperature-dependent behavior is key to device optimization.
Conventional models describe low-temperature behavior well.

Purpose of the Study:

To investigate the temperature dependence of critical current modulation in low-Tc and high-Tc Josephson junctions.
To explore the transition from local to nonlocal electrodynamics in these junctions.
To compare experimental findings with theoretical predictions.

Main Methods:

Studied critical current modulation I(c)(H) in Nb/CuNi/Nb and YBa2Cu3O(7-δ) junctions.
Analyzed temperature dependence of I(c)(H) and modulation field ΔH.
Extracted London penetration depth λ from experimental data.

Main Results:

At low temperatures, junctions showed conventional behavior governed by the local sine-Gordon equation.
At elevated temperatures, ΔH became nearly temperature-independent and did not vanish at Tc.
Observed a crossover from local to nonlocal electrodynamics as λ(T) exceeded electrode thickness.

Conclusions:

The observed unusual behavior at elevated temperatures aligns with nonlocal electrodynamics predictions.
This study provides a method to extract London penetration depth values.
A temperature-driven transition in electrodynamics occurs when penetration depth becomes comparable to electrode dimensions.