Article

# One-dimensional and two-dimensional quantum systems on carbon nanotube bundles.

Institut Laue-Langevin, BP 156, 38042 Grenoble, France.

Physical Review Letters (Impact Factor: 7.73). 11/2005; 95(18):185302. DOI: 10.1103/PhysRevLett.95.185302 Source: PubMed

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**ABSTRACT:**The heat capacity of bundles of closed-cap single-walled carbon nanotubes (SWNT) with one-dimensional chains of nitrogen molecules adsorbed in the grooves has been first experimentally studied at temperatures from 2K to 40K using an adiabatic calorimeter. The contribution of nitrogen C(T) to the total heat capacity has been separated. In the region 2-8K the behaviour of the curve C(T) is qualitatively similar to the theoretical prediction of the phonon heat capacity of 1D chains of krypton (Kr) atoms localized in the grooves of SWNT bundles. Below 3K the dependence C(T) is linear. Above 8K the dependence C(T) becomes steeper in comparison with the case of Kr atoms. This behaviour of the heat capacity C(T) is due to the contribution of the rotational degrees of freedom of the nitrogen molecules.Low Temperature Physics 05/2013; 39:568-573. · 0.82 Impact Factor - [Show abstract] [Hide abstract]

**ABSTRACT:**The phase diagrams of $^4$He adsorbed on the external surfaces of single armchair carbon nanotubes with radii in the range 3.42 -- 10.85 \AA \ are calculated using the diffusion Monte Carlo method. For nanotubes narrower than a (10,10) one, the ground state is an incommensurate solid similar to the one found for H$_2$ on the same substrates. For wider nanotubes, the phase with the minimum energy per particle is a liquid layer. Curved $\sqrt 3 \times \sqrt 3$ registered solids similar to the ones found on graphene and graphite were unstable for all the tubes considered.Physical review. B, Condensed matter 10/2012; 86(16). · 3.77 Impact Factor - [Show abstract] [Hide abstract]

**ABSTRACT:**The experimental studies of the heat capacity of 1D chains of xenon atoms adsorbed in the outer grooves of bundles of closed single-walled carbon nanotubes have been first made at temperature range 2–30 K with the adiabatic calorimeter. The experimental data have been compared with theory [A. Šiber, Phys. Rev. B 66, 235414 (2002)]. The experimental and theoretical heat capacity curves are close below 8 K. Above 8 K the experimental curve exceeds the theoretical one and excess capacity C(T) increases monotonously with temperature. We assume that the C(T) caused mainly by the increase of the distance between the neighboring xenon atoms in the chain with increasing temperature.Low Temperature Physics 01/2013; · 0.82 Impact Factor

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