Abstract
A controlled local enhancement of superconductivity yields unexpected modifications in the vortex dynamics. This local enhancement has been achieved by designing an array of superconducting Nb nanostructures embedded in a V superconducting film. The most remarkable findings are: (i) vanishing of the main commensurability effect between the vortex lattice and the array unit cell, (ii) hysteretic behavior in the vortex dynamics, (iii) broadening of the vortex liquid phase and (iv) strong softening of the vortex lattice. These effects can be controlled and they can be quenched by reducing the Nb array superconducting performance applying an in-plane magnetic field. These results can be explained by taking into account the repulsive potential landscape created by the superconducting Nb nanostructures on which vortices move.
Highlights
November 2019V Rollano, A Gomez, A Muñoz-Noval, J del Valle, M Menghini, M C de Ory, J L Prieto, E Navarro, E M Gonzalez and J L Vicent
Long time ago Anderson set the focus on the behavior of superconductors at the nanoscale
We show that local enhancement of superconductivity allows modifying mixed state effects in hybrid systems made of two superconductors; the most relevant ones are quenched of the main commensurability effect, softening of pinning forces, broadening of the vortex liquid phase and the emergence of hysteresis effects in the vortex dynamics
Summary
V Rollano, A Gomez, A Muñoz-Noval, J del Valle, M Menghini, M C de Ory, J L Prieto, E Navarro, E M Gonzalez and J L Vicent.
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