Detection of discretized single-shell penetration in mesoscopic vortex matter

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 thi...

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Bibliographic Details
Published in:Journal of physics. Conference series 2014-12, Vol.568 (2), p.22010
Main Authors: Dolz, M I, Fasano, Y, Bolecek, N R Cejas, Pastoriza, H, Konczykowski, M, Beek, C J van der
Format: Article
Language:English
Subjects:
Discretization
Disks
Magnetic measurement
Magnetic signals
Penetration
Physics
Vortices
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Summary: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.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/568/2/022010