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Scanning SQUID Study of Vortex Manipulation by Local Contact
Published on: February 1, 2017
Vortex solid phase with frozen undulations in superconducting Josephson-junction arrays in external magnetic fields
Hajime Yoshino1, Tomoaki Nogawa, Bongsoo Kim
1Department of Earth and Space Science, Faculty of Science, Osaka University, Toyonaka 560-0043, Japan.
Physical Review Letters
|January 15, 2011
Summary
Researchers discovered a novel vortex solid with inherent randomness in frustrated Josephson-junction arrays. This vortex solid exhibits unique sliding and jamming behaviors due to anisotropic couplings and magnetic fields.
Area of Science:
- Condensed Matter Physics
- Theoretical Physics
- Materials Science
Background:
- Josephson-junction arrays are crucial in superconductivity research.
- Frustration and anisotropic couplings introduce complex behaviors in condensed matter systems.
- External magnetic fields can induce and manipulate vortex structures.
Purpose of the Study:
- To theoretically investigate the properties of a vortex solid in a frustrated Josephson-junction array.
- To explore the impact of anisotropic couplings and external magnetic fields on vortex behavior.
- To identify and characterize novel metastable states and their dynamics.
Main Methods:
- Theoretical analysis of a frustrated Josephson-junction array model.
- Investigation under an external magnetic field with anisotropic couplings.
- Analytical derivation of vortex stripe formation and undulation.
Main Results:
- A vortex solid with self-generated randomness was theoretically identified.
- Vortices form stripes parallel to the weaker coupling direction.
- A continuous, gapless band of metastable states with random stripe deformation was found.
- The vortex solid exhibits anisotropic sliding and jamming behaviors.
Conclusions:
- The study reveals a unique vortex solid state with inherent randomness.
- Anisotropic couplings lead to directional sliding and jamming of the vortex solid.
- The findings offer insights into the complex dynamics of frustrated superconducting systems.
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