Little-Parks oscillations near a persistent current loop

Details Little-Parks oscillations near a persistent current loop Little-Parks oscillations near a persistent current loop

2012-04-24

arxiv.org/abs/1204.5257v1

Physics

Condensed Matter

Superconductivity

13 pages, 12 figures

Scientific paper

10.1103/PhysRevB.85.144512

We investigate the Little-Parks oscillations caused by a persistent current loop set on the top edge of a mesoscopic superconducting thin-walled cylinder with a finite height. For a short cylinder the Little-Parks oscillations are approximately the same ones as the standard effect, as there is only one magnetic flux piercing the cylinder. For a tall cylinder the inhomogeneity of the magnetic field makes different magnetic fluxes pierce the cylinder at distinct heights and we show here that this produces two distinct Little-Parks oscillatory regimes according to the persistent current loop. We show that these two regimes, and also the transition between them, are observable in current measurements done in the superconducting cylinder. The two regimes stem from different behavior along the height, as seen in the order parameter, numerically obtained from the Ginzburg-Landau theory through the finite element method

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