Detection of discretized single-shell penetration in mesoscopic vortex matter

27th International Conference on Low Temperature Physics

Dolz, M.I.^1 ; Fasano, Y.^2 ; Bolecek, N.R. Cejas^2 ; Pastoriza, H.^2 ; Konczykowski, M.^3 ; Van Der Beek, C.J.V.D.^3

Departamento de Física, Universidad Nacional de San Luis, CONICET, Argentina^1

Laboratorio de Bajas Temperaturas, Centro Atómico Bariloche, CNEA, Bariloche, Argentina^2

Laboratoire des Solides Irradiés, Ecole Polytechnique, CNRS URA-1380, Palaiseau, France^3

关键词: Experimental evidence;    Flux penetration;    Geometrical analysis;    High resolution;    Magnetic signals;    Third harmonic;    Transmittivity;    Vortex densities;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/568/2/022010/pdf
DOI  :  10.1088/1742-6596/568/2/022010

来源: IOP

【 摘 要 】

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.