Gate-Controlled Superconductivity in a Diffusive Multiwalled Carbon Nanotube
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© 2007 American Physical Society (APS). This is the accepted version of the following article: 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, which has been published in final form at http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.98.087002.
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2007
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Language
en
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087002/1-4
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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
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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