Phys. Rev. Lett. 98, 087002 (2007) [4 pages]Gate-Controlled Superconductivity in a Diffusive Multiwalled Carbon NanotubeSee Also: Publisher's Note Received 5 September 2006; published 21 February 2007; corrected 26 February 2007 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∝Icm-α 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)]. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.087002
DOI:
10.1103/PhysRevLett.98.087002
PACS:
74.70.Wz, 74.78.Na
See AlsoPublisher's Note: T. Tsuneta, L. Lechner, and P. J. Hakonen, Publisher’s Note: Gate-Controlled Superconductivity in a Diffusive Multiwalled Carbon Nanotube [Phys. Rev. Lett. 98, 087002 (2007)], Phys. Rev. Lett. 98, 099904 (2007). |
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