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Dilation of the Giant Vortex State in a Mesoscopic Superconducting Loop

S. Pedersen·G. R. Kofod·J. C. Hollingbery·C. B. Sørensen·P. E. Lindelof
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Abstract

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 $μ$-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 $Φ_{0}=h/2e$. 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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S. Pedersen, G. R. Kofod, J. C. Hollingbery, C. B. Sørensen, P. E. Lindelof. 2001-07-11. Dilation of the Giant Vortex State in a Mesoscopic Superconducting Loop. https://doi.org/10.1103/physrevb.64.104522

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