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Scanning SQUID Study of Vortex Manipulation by Local Contact

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Published on: February 1, 2017

Vortex breaking and cutting in type II superconductors.

A Palau¹, R Dinner, J H Durrell

¹Department of Materials Science, Cambridge University, Pembroke Street, Cambridge CB2 3QZ, United Kingdom.

Physical Review Letters

|October 15, 2008

Summary

This summary is machine-generated.

In technological superconductors, critical current is limited by individual vortex deformation, not cross-joining. This finding clarifies flux pinning mechanisms in superconducting materials.

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Area of Science:

Condensed matter physics
Materials science

Background:

Technological superconductors carry large currents, but their performance is limited by flux vortices.
The Lorentz force on these vortices is counteracted by pinning centers, influencing the critical current.
Vortex entanglement, cutting, and cross-joining are proposed mechanisms affecting critical current.

Purpose of the Study:

To investigate the roles of vortex entanglement, cutting, and cross-joining in determining the critical current.
To understand the dominant mechanisms limiting critical current in technologically relevant superconducting structures.

Main Methods:

Fabrication of layered superconducting structures with alternating weak and strong pinning layers.
Experimental measurements of critical current in these structures.
Quantitative modeling to analyze the contributions of different vortex dynamics.

Main Results:

The critical current in the studied structures is primarily limited by the deformation of individual flux vortices.
Cross-joining processes between vortices do not appear to be the limiting factor for critical current in this configuration.
The interplay between pinning and vortex dynamics was quantitatively modeled.

Conclusions:

Individual vortex deformation is the key mechanism controlling critical current in these layered superconductors.
The findings provide a clearer understanding of flux pinning and critical current limitations.
This research informs the design of more efficient superconducting devices.