Superconductivity of nanowires produced by metal decoration of carbon nanotubes |
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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, 971—974 (2000).
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