Detection of discretized single-shell penetration in mesoscopic vortex matter
Dolz, Moira Inés · Fasano, Yanina · Bolecek, Néstor René Cejas · Pastoriza, Hernán · Konczykowski, Marcin · van der Beek, Cornelius Jacominus
Original · EN
We investigated configurational changes in mesoscopic vortex matter with less than thousand vortices during flux penetration in freestanding 50 μm diameter disks of Bi₂Sr₂CaCu₂O₈ ₊δ. 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.
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