Gate-controlled superconductivity in a diffusive multiwalled carbon nanotube

T. Tsuneta, L. Lechner, P. J. Hakonen

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Abstract

We have investigated electrical transport in a diffusive multiwalled carbon nanotube contacted using superconducting leads made of an Al/Ti sandwich structure. We find proximity-induced superconductivity with measured critical currents up to Icm=1.3  nA, tunable by the gate voltage down to 10 pA. The supercurrent branch displays a finite zero bias resistance which varies as R0∝I−αcm with α=0.74. Using IV characteristics of junctions with phase diffusion, a good agreement is obtained with the Josephson coupling energy in the long, diffusive junction model of A. D. Zaikin and G. F. Zharkov [Sov. J. Low Temp. Phys. 7, 184 (1981)].
Original languageEnglish
Article number087002
Pages (from-to)1-4
Number of pages4
JournalPhysical Review Letters
Volume98
Issue number8
DOIs
Publication statusPublished - 2007
MoE publication typeA1 Journal article-refereed

Keywords

  • superconductors
  • carbon nanotubes

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