Dynamics of Vortex Shells in Mesoscopic Superconducting Corbino Disks
V. R. Misko, F. M. Peeters
Abstract
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 I0, in a Corbino setup. At very low I0, the system exhibits rigid body rotation while at some critical current Ic,i vortex shells rotate separately with angular velocities omegai. This critical current Ic,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 omegai as a function of I0 and T and the dynamically-induced melting transition.
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