Detection of discretized single-shell penetration in mesoscopic vortex matter

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

Journal of Physics: Conference Series

IOP

Año: 2014 vol. 568 p. 1 - 6

1742-6596

We investigated configurational changes in mesoscopic vortex matter with less than thousand vortices during flux penetration in freestanding 50 μm diameter disks of BSCCO. High-resolution AC and DC local magnetometry data reveal oscillations in the transmittivity echoed in peaks in the third-harmonics 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 single-shells of vortices having a shape that mimics the sample edge.