Scanning SQUID microscopy of vortex clusters in multiband superconductors

Abstract

In type-1.5 superconductors, vortices emerge in clusters, which grow in size with increasing magnetic field. These novel vortex clusters and their field dependence are directly visualized by scanning SQUID microscopy at very low vortex densities in MgB2 single crystals. Our observations are elucidated by simulations based on a two-gap Ginzburg-Landau theory in the type-1.5 regime.

4 pages, 5 figures, to be published in Physical Review B

References in corpus (4)

• Type-1.5 Superconductors
• Vortex Imaging in the pi-Band of Magnesium Diboride
• Ginzburg-Landau theory of vortices in a multi-gap superconductor
• Violation of the London Law and Onsager-Feynman quantization in multicomponent superconductors

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