Low Temperature Physics: 36, 635 (2010); https://doi.org/10.1063/1.3479333 (3 pages)
Fizika Nizkikh Temperatur: Volume 36, Number 7 (July 2010), p. 797-799    ( to contents , go back )

Quantum effects in the radial thermal expansion of bundles of single-walled carbon nanotubes doped with 4He

A.V. Dolbin, V.B. Esel'son, V.G. Gavrilko, V.G. Manzhelii, N.A. Vinnikov, and S.N. Popov

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
E-mail: dolbin@ilt.kharkov.ua

B. Sundqvist

Department of Physics, Umea University, SE - 901 87 Umea, Sweden

Received 26 March, 2010

Abstract

The radial thermal expansion αr of bundles of single-walled carbon nanotubes saturated with 4He impurities to the molar concentration 9.4% has been investigated in the interval 2.5–9.5 K using the dilatometric method. In the interval 2.1–3.7 K αr is negative and is several times higher than the negative αr for pure nanotube bundles. This most likely points to 4He atom tunneling between different positions in the nanotube bundle system. The excess expansion was reduced with decreasing 4He concentration.

PACS: 65.80.–g Thermal properties of small particles, nanocrystals, nanotubes, and other related systems.

Key words: radial thermal expansion, single-walled carb3on nanotube, helium, quantum effects.

Download 209464 byte View Contents