Evidence of 1D behaviour of He$^4$ confined within carbon-nanotube bundles

Details Evidence of 1D behaviour of He$^4$ confined within carbon-nanotube bundles Evidence of 1D behaviour of He$^4$ confined within carbon-nanotube bundles

2003-01-30

arxiv.org/abs/cond-mat/0301584v1

Physics

Condensed Matter

Materials Science

4 pages, 3 figures, submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.91.025901

We present the first low-temperature thermodynamic investigation of the controlled physisorption of He$^{4}$ gas in carbon single-wall nanotube (SWNT) samples. The vibrational specific heat measured between 100 mK and 6 K demonstrates an extreme sensitivity to outgassing conditions. For bundles with a few number of NTs the extra contribution to the specific heat, C$_{ads}$, originating from adsorbed He$^{4}$ at very low density displays 1D behavior, typical for He atoms localized within linear channels as grooves and interstitials, for the first time evidenced. For larger bundles, C$_{ads}$ recovers the 2D behaviour akin to the case of He$^{4}$ films on planar substrates (grafoil).

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