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Abstract
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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1 Departamento de Física, Universidad Nacional de San Luis, CONICET, Argentina
2 Laboratorio de Bajas Temperaturas, Centro Atómico Bariloche, CNEA, Bariloche, Argentina
3 Laboratoire des Solides Irradiés, Ecole Polytechnique, CNRS URA-1380, Palaiseau, France