Dilation of the Giant Vortex State in a Mesoscopic Superconducting Loop

Details Dilation of the Giant Vortex State in a Mesoscopic Superconducting Loop Dilation of the Giant Vortex State in a Mesoscopic Superconducting Loop

2001-07-11

arxiv.org/abs/cond-mat/0107220v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

12 pages, 5 figures. Accepted for publication in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.64.104522

We have experimentally investigated the magnetisation of a mesoscopic aluminum loop at temperatures well below the superconducting transition temperature $T_{c}$. The flux quantisation of the superconducting loop was investigated with a $\mu$-Hall magnetometer in magnetic field intensities between $\pm 100 {Gauss}$. The magnetic field intensity periodicity observed in the magnetization measurements is expected to take integer values of the superconducting flux quanta $\Phi_{0}=h/2e$. A closer inspection of the periodicity, however, reveal a sub flux quantum shift. This fine structure we interpret as a consequence of a so called giant vortex state nucleating towards either the inner or the outer side of the loop. These findings are in agreement with recent theoretical reports.

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