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Updated: Feb 18, 2026
06:53
Scanning SQUID Study of Vortex Manipulation by Local Contact
Published on: February 1, 2017
7.3K
Parallel magnetic field suppresses dissipation in superconducting nanostrips
Yong-Lei Wang1,2,3, Andreas Glatz1,4, Gregory J Kimmel1,5
1Materials Science Division, Argonne National Laboratory, Argonne, IL 60439.
Summary
In type-II superconductors, applying parallel electric current and magnetic fields can suppress vortex motion. This research reveals a method to reduce resistance and improve superconducting material performance.
Area of Science:
- Condensed Matter Physics
- Materials Science
Background:
- Vortex motion in type-II superconductors causes electrical resistance.
- Reducing this vortex-induced resistance is crucial for practical superconductivity.
Purpose of the Study:
- To investigate the effect of parallel electric current and magnetic fields on vortex behavior in superconductors.
- To explore methods for suppressing dissipation and re-entering the superconducting state.
Main Methods:
- Experimental measurements of resistive behavior in a superconducting Mo0.79Ge0.21 nanostrip.
- Large-scale simulations using the 3D time-dependent Ginzburg-Landau model.
Main Results:
- A dissipative state emerged with increasing magnetic field, followed by a resistance drop indicating reentrance to the superconducting state.
- Simulations identified unwinding of twisted vortices as the cause of the intermediate resistive state.
- Increasing magnetic field suppressed this instability by improving vortex lattice accommodation to pinning.
Conclusions:
- Parallel magnetic fields and electric currents can suppress dissipation caused by vortex motion.
- Geometrical confinement and magnetic field manipulation can significantly enhance the performance of superconducting materials.
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