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Quantum phenomena in the radial thermal expansion of bundles of single-walled carbon nanotubes doped with 3He. A giant isotope effect
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2011 (English)In: Low temperature physics (Woodbury, N.Y., Print), ISSN 1063-777X, Vol. 37, no 6, 544-546 p.Article in journal (Refereed) Published
Abstract [en]

The radial thermal expansion αr of bundles of single-walled carbon nanotubes saturated with 3He up to the molar concentration 9.4% has been investigated in the temperature interval 2.1–9.5 K by high-sensitivity capacitance dilatometry. In the interval 2.1–7 K a negative αr was observed, with a magnitude which exceeded the largest negative αr values of pure and 4He-saturated nanotubes by three and two orders of magnitude, respectively. The contributions of the two He isotope impurities to the negative thermal expansion of the nanotube bundles are most likely connected with the spatial redistribution of 4He and 3He atoms by tunneling at the surface and inside nanotube bundles. The isotope effect turned out to be huge, probably owing to the higher tunneling probability of 3He atoms.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2011. Vol. 37, no 6, 544-546 p.
Keyword [en]
Single-walled carbon nanotubes, radial thermal expansion, low temperature, quantum effects, 3He, isotope effect
National Category
Condensed Matter Physics
Research subject
URN: urn:nbn:se:umu:diva-43444DOI: 10.1063/1.3624780OAI: diva2:413920
Swedish Research Council, 621-2010-3732

Simultaneous publication in Fizika Nizkikh Temperatur (Kharkov) volume 37, issue 6, pages 685-687 (2011).

Available from: 2013-02-07 Created: 2011-04-29 Last updated: 2014-02-10Bibliographically approved

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Sundqvist, Bertil
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