Gate-controlled superconductivity in diffusive multiwalled carbon nanotube

Details Gate-controlled superconductivity in diffusive multiwalled carbon nanotube Gate-controlled superconductivity in diffusive multiwalled carbon nanotube

2006-08-22

arxiv.org/abs/cond-mat/0608479v1

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures

Scientific paper

We have investigated electrical transport in a diffusive multiwalled carbon nanotube contacted using superconducting leads made of Al/Ti sandwich structure. We find proximity-induced superconductivity with measured critical currents up to I_cm = 1.3 nA, tunable by gate voltage down to 10 pA. The supercurrent branch displays a finite zero bias resistance which varies as R_0 proportional to I_cm^-alpha with alpha=0.74. Using IV-characteristics of junctions with phase diffusion, a good agreement is obtained with 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)).

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