Physics – Condensed Matter – Superconductivity
Scientific paper
2000-12-06
Phys. Rev. B 64, 014517 (2001)
Physics
Condensed Matter
Superconductivity
17 pages, 10 figures; E-mail addresses: devreese@uia.ua.ac.be, fomin@uia.ua.ac.be, misko@uia.ua.ac.be
Scientific paper
10.1103/PhysRevB.64.014517
In recent experiments with a superconducting nanosized Pb bridge formed between a scanning tunneling microscope tip and a substrate, superconductivity has been detected at magnetic fields, which are few times larger than the third (surface) critical field. We describe the observed phenomenon on the basis of a numerical solution of the Ginzburg-Landau equations in a model structure consisting of six conoids. The spatial distribution of the superconducting phase is shown to be strongly inhomogeneous, with concentration of the superconducting phase near the narrowest part (the ``neck'') of the bridge. We show that suppression of superconductivity in the bridge by applied magnetic field or by temperature first occurs near the bases and then in the neck region, what leads to a continuous superconducting-to-normal resistive transition. A position of the transition midpoint depends on temperature and, typically, is by one order of magnitude higher than the second critical field H_c2. We find that the vortex states can be realized in the bridge at low temperatures T/T_c < 0.6. The vortex states lead to a fine structure of the superconducting-to-normal resistive transition. We also analyze vortex states in the bridge, which are characterized by a varying vorticity as a function of the bridge's height.
Devreese J. T.
Fomin V. M.
Misko V. R.
No associations
LandOfFree
Strong enhancement of superconductivity in a nanosized Pb bridge does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Strong enhancement of superconductivity in a nanosized Pb bridge, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Strong enhancement of superconductivity in a nanosized Pb bridge will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-632480