Vortex quantum tunnelling versus thermal activation in ultrathin superconducting nanoislands

Details Vortex quantum tunnelling versus thermal activation in ultrathin superconducting nanoislands Vortex quantum tunnelling versus thermal activation in ultrathin superconducting nanoislands

2011-12-07

arxiv.org/abs/1112.1543v1

Physics

Condensed Matter

Superconductivity

4 pages, 2 figures

Scientific paper

We consider two possible mechanisms for vortex fluctuative entry/exit through surface barrier in ultrathin superconducting nanoislands made of Pb and consisting of just few monoatomic layers. For the case of vortex entry, macroscopic quantum tunnelling dominates on the major part of the temperature/flux phase diagram, except of the high-temperature/low-flux domain. For the case of vortex exit, thermal activation turns out to be more probable. This nontrivial result is due to the subtle balance between barrier height and width, which determine rates of thermal activation and quantum tunnelling, respectively.

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