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.
@article{arxiv.1001.2199,
title = {Scanning SQUID microscopy of vortex clusters in multiband superconductors},
author = {Taichiro Nishio and Vu Hung Dao and Qinghua Chen and Liviu F. Chibotaru and Kazuo Kadowaki and Victor V. Moshchalkov},
journal= {arXiv preprint arXiv:1001.2199},
year = {2015}
}
Comments
4 pages, 5 figures, to be published in Physical Review B