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Mapping degenerate vortex states in a kagome lattice of elongated antidots via scanning Hall probe microscopy
Journal Contribution - Journal Article
We investigate the degeneracy of the superconducting vortex matter ground state by directly visualizing thevortex configurations in a kagome lattice of elongated antidots via scanning Hall probe microscopy. The observedvortex patterns, at specific applied magnetic fields, are in good agreement with the configurations obtainedusing time-dependent Ginzburg-Landau simulations. Both results indicate that the long-range interaction in thisnanostructured superconductor is unable to lift the degeneracy between different vortex states and the patternformation is mainly ruled by the nearest-neighbor interaction. This simplification makes it possible to identify aset of simple rules characterizing the vortex configurations.We demonstrate that these rules can explain both theobserved vortex distributions and the magnetic-field-dependent degree of degeneracy.
Journal: Physical Review B
Pages: 1 - 6