Dynamics of Vortex Shells in Mesoscopic Superconducting Corbino Disks

Details Dynamics of Vortex Shells in Mesoscopic Superconducting Corbino Disks Dynamics of Vortex Shells in Mesoscopic Superconducting Corbino Disks

2006-10-30

arxiv.org/abs/cond-mat/0610836v1

Phys. Rev. B 74, 174507 (2006)

Physics

Condensed Matter

Superconductivity

5 pages, 5 figures

Scientific paper

10.1103/PhysRevB.74.174507

In mesoscopic superconducting disks vortices form shell structures as recently observed in Nb disks. We study the dynamics of such vortices, driven by an external current I_0, in a Corbino setup. At very low I_0, the system exhibits rigid body rotation while at some critical current I_c,i vortex shells rotate separately with angular velocities omega_i. This critical current I_c,i has a remarkable non-monotonous dependence on the applied magnetic field which is due to a dynamically-induced structural transition with a rearrangement of vortices over the shells similar to the Coster-Kronig transition in hollow atoms. Thermally-activated externally-driven flux motion in a disk with pinning centers explains experimentally observed omega_i as a function of I_0 and T and the dynamically-induced melting transition.

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