Alteration of superconductivity and radial breathing modes in suspended ropes of carbon nanotubes by organic polymer coatings
M. Ferrier, A. Yu. Kasumov, V. Agache, L. Buchaillot, A-M. Bonnot, C. Naud, V. Bouchiat, R. Deblock, M. Kociak, M. Kobylko, S. Guéron, H. Bouchiat
DOI 10.1103/PhysRevB.74.241402 · Physical Review B
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Abstract
We have altered the superconductivity of a suspended rope of single walled carbon nanotubes, by coating it with organic polymers. Upon coating, the normal state resistance of the rope changes by less than 20%. But superconductivity, which on the bare rope shows up as a substantial resistance decrease below 300mK, is gradually suppressed. We correlate this to the suppression of radial breathing modes, measured with raman spectroscopy on suspended single and double-walled carbon nanotubes. This points to the breathing phonon modes as being responsible for superconductivity in ropes of single walled carbon nanotubes.
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