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TODAY OCTOBER 23, 2018

Superconductivity of nanowires produced by metal decoration of carbon nanotubes

The picture shows a superconducting MoGe nanowire (gray line) produced by sputter-coating a single-wall carbon nanotube placed across a deep trench etched into the substrate
The left picture shows a superconducting MoGe nanowire (gray line) produced by sputter-coating a single-wall carbon nanotube placed across a deep trench etched into the substrate.
The left picture shows a superconducting MoGe nanowire (gray line) produced by sputter-coating a single-wall carbon nanotube placed across a deep trench etched into the substrate. The trench appears black in the picture. The wire shown on the picture is about 8 nm in diameter. The smallest diameter that was obtain reliably with this method is 5 nm. A quantum superconductor-insulator (SI) transition is found in ultrathin superconducting nanowires of this type. The plots on the right show the measurements on a series of nanowires of various thickness. An SI transition is seen. The transition occurs when the normal resistance of the wire reached the quantum resistance for Cooper pairs, i.e. Rq=h/4e2~6.45 kW.


1. A. Bezryadin, Superconductivity in nanowires: Fabrication and quantum transport (Wiley-VCH, October 2012).
2. A. Bezryadin, C.N. Lau, and M. Tinkham, "Quantum suppression of superconductivity in ultrathin nanowires," Nature 404, 971974 (2000).
See also images:

An optical mask is aligned over the substrate and the sample is exposed to UV light. The mask is designed to isolate a single nanotube and simultaneously create an electrode pattern for later measurements.
Nanowerk Nanotechnology Portal
http://www.nanowerk.com

Nanohedron
http://www.nanohedron.com

Biomolecules
http://perso.curie.fr/Simon.Sc..


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