Single vortex ­shell penetration in mesoscopic vortex matter

M. I. DOLZ; Y. FASANO; N. R. CEJAS BOLECEK; H. PASTORIZA; M. KONCZYKOWSKI; C. J. VAN DER BEEK

Buenos Aires

Conferencia; Poster en 27th International Conference on Low Temperature Physics; 2014

We investigated configurational changes in mesoscopic vortex matter with less than thousand vortices during flux penetration in freestanding 50 μm diameter disks of BSCCO . By means of high­resolution AC and DC local magnetometry we reveal oscillations in the transmittivity echoed in peaks in the third­harmonics magnetic signal fainting on increasing vortex density. By means of extra experimental evidence and a simple geometrical analysis we show that these features fingerprint the discretized entrance of single­shells of vortices having a shape that mimics the sample edge.