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Multiquanta vortex entry and vortex-antivortex pattern expansion in a superconducting microsquare with a magnetic
Carlos Carballeira1, Victor V Moshchalkov, Liviu F Chibotaru
1Nanoscale Superconductivity and Magnetism Group, INPAC-Institute for Nanoscale Physics and Chemistry, K.U. Leuven, Celestijnenlaan 200 D, 3001 Leuven, Belgium. fmcharly@usc.es
Physical Review Letters
|December 31, 2005
Summary
We studied superconductivity nucleation in a microsquare with a magnetic dot. The magnetic dot enhances vortex-antivortex patterns, aiding experimental observation of multiquanta vortex entries.
Area of Science:
- Condensed Matter Physics
- Materials Science
Background:
- Superconductivity nucleation is crucial for understanding superconducting devices.
- Magnetic dots can influence magnetic and electronic properties of superconductors.
Purpose of the Study:
- Investigate superconductivity nucleation in a microsquare geometry.
- Analyze the effect of a magnetic dot on superconducting phase boundaries and vortex behavior.
Main Methods:
- Theoretical calculations of normal-superconducting phase boundaries.
- Analysis of vorticity and vortex-antivortex patterns.
Main Results:
- Observed cusplike behavior in T(c)(H) phase boundaries with asymmetry.
- Detected multiquanta vortex entries due to asymmetric phase boundaries.
- Magnetic dot dramatically expanded symmetry-consistent vortex-antivortex patterns.
Conclusions:
- The magnetic dot significantly influences superconductivity nucleation and vortex dynamics.
- Facilitates experimental observation of complex vortex patterns and multiquanta entries.