Gate-Controlled Superconductivity in a Diffusive Multiwalled Carbon Nanotube

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Journal Title
Journal ISSN
Volume Title
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2007
Major/Subject
Mcode
Degree programme
Language
en
Pages
087002/1-4
Series
Physical Review Letters, Volume 98, Issue 8
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 exp −α cm 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)].
Description
Keywords
superconductors, carbon nanotubes
Other note
Citation
Tsuneta, T. & Lechner, L. & Hakonen, Pertti J. 2007. Gate-Controlled Superconductivity in a Diffusive Multiwalled Carbon Nanotube. Physical Review Letters. Volume 98, Issue 8. 087002/1-4. ISSN 0031-9007 (printed). DOI: 10.1103/physrevlett.98.087002