Pinning-induced formation of vortex clusters and giant vortices in mesoscopic superconducting disks

Details Pinning-induced formation of vortex clusters and giant vortices in mesoscopic superconducting disks Pinning-induced formation of vortex clusters and giant vortices in mesoscopic superconducting disks

2006-11-17

arxiv.org/abs/cond-mat/0611458v1

Physics

Condensed Matter

Superconductivity

12 pages, 5 figures; the size of Figure 2 on p. 9 was reduced, as some information on it was lost in original submission

Scientific paper

Multi-quanta, or giant, vortices (GVs) are known to appear in very small superconductors near the superconducting transition due to strong confinement of magnetic flux. Here we present evidence for a new, pinning-related, mechanism for the formation of GVs. Using Bitter decoration to visualise vortices in small Nb disks, we show that confinement in combination with strong disorder causes individual vortices to merge into clusters or even GVs well below Tc and Hc2, in contrast to well-defined shells of individual vortices found in the absence of pinning.

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