Scanning SQUID microscopy of vortex clusters in multiband superconductors
Taichiro Nishio, Vu Hung Dao, Qinghua Chen, Liviu F. Chibotaru, Kazuo, Kadowaki, Victor V. Moshchalkov
TL;DR
This study visualizes vortex clusters in multiband superconductors using scanning SQUID microscopy, revealing their growth with magnetic field and supported by two-gap Ginzburg-Landau simulations.
Contribution
First direct visualization of vortex clusters in type-1.5 superconductors and their field dependence using scanning SQUID microscopy.
Findings
Vortex clusters grow with increasing magnetic field.
Scanning SQUID microscopy effectively visualizes vortex arrangements.
Simulations confirm the two-gap Ginzburg-Landau theory explains observed phenomena.
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.
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