Thermal suppression of surface barrier in ultrasmall superconducting structures
W. V. Pogosov
DOI 10.1103/PhysRevB.81.184517 · Physical Review B
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Abstract
In the recent experiment by Cren et al. [Phys. Rev. Lett. 102, 127005 (2009)], no hysteresis for vortex penetration and expulsion from the nanoisland of Pb was observed. In the present paper, we argue that this effect can be associated with the thermoactivated surmounting of the surface barrier by a vortex. The typical entrance (exit) time is found analytically from the Fokker-Planck equation, written in the form suitable for the extreme vortex confinement. We show that this time is several orders of magnitude smaller than 1 s under the conditions of the experiment considered. Our results thus demonstrate a possibility for the thermal suppression of the surface barrier in nanosized low-Tc superconductors. We also briefly discuss other recent experiments on vortices in related structures.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.2 | Pressure not reported | unknown |
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