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.
@article{arxiv.1410.7418,
title = {Detection of discretized single-shell penetration in mesoscopic vortex matter},
author = {Moira Inés Dolz and Yanina Fasano and Néstor René Cejas Bolecek and Hernán Pastoriza and Marcin Konczykowski and Cornelius Jacominus van der Beek},
journal= {arXiv preprint arXiv:1410.7418},
year = {2014}
}