Abstract
We study the position-dependence of vortex motion around asymmetric mesoscopic superconducting ring for the external current flowing from inner boundaries to outer boundaries based on time-dependent Ginzburg-Landau theory. The inner hole position can have a great impact on not only the vortex configuration but also the current-voltage (I-V) characteristics. Different from the vortex rotation in the symmetric structure, we demonstrate that vortices enter/exit from outer boundaries periodically and the formation of curved vortex channel strongly depend on the inner hole position. As the inner hole is close enough to the outer boundaries, vortices get deformed even at low applied current. Flux-flow state (i.e., slow-moving Abrikosov vortices) and phase-slip state (i.e., fast-moving vortices) coexist during a multiharmonic voltage oscillation. In this way, the vortex motion and critical current of the sample can be manipulated by the hole position. At the critical current corresponding to the abrupt jump in I-V curve, vortex motion becomes unstable and the vortices are trapped in the hole for the symmetric ring, while the vortices disappear at the outer boundaries for the asymmetric ring.
Highlights
When a thin superconducting film is placed in a perpendicular magnetic field larger than the critical value, Abrikosov vortices penetrate the sample which form a triangular vortex lattice in the absence of pinning
To investigate the response of such asymmetric system to an external current, we start with discussing the influence of the inner hole position on the I-V characteristics
Vortices can move under the action of Lorentz force
Summary
When a thin superconducting film is placed in a perpendicular magnetic field larger than the critical value, Abrikosov vortices penetrate the sample which form a triangular vortex lattice in the absence of pinning. We investigated the vortex dynamics in a square superconducting ring.[32] The vortices can move without crossing the sample boundaries at a fixed applied field, which is analogous to the Corbino disk,[33,34,35,36,37,38,39,40] when the inner hole deviated from the center, there will exhibited significantly difference vortex dynamical phenomenon. To further understand the dynamical properties of the asymmetric loop for the current flowing from inner boundaries to outer boundaries, in the present work, we study the effect of hole position on I-V characteristics and vortex trajectories in a asymmetric superconducting ring. It was demonstrated that the variations of inner hole position can have a great impact on the voltage signal even at the same field which leads to different kinds of kinematic vortices with different velocities
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