Anisotropic Condensation of Helium in Nanotube Bundles

Details Anisotropic Condensation of Helium in Nanotube Bundles Anisotropic Condensation of Helium in Nanotube Bundles

1999-08-16

arxiv.org/abs/cond-mat/9908234v2

Physics

Condensed Matter

Statistical Mechanics

8 pages, 3 figures, submitted to PRL (corrected typo in abstract)

Scientific paper

10.1103/PhysRevLett.84.3883

Helium atoms are strongly attracted to the interstitial channels within a bundle of carbon nanotubes. The strong corrugation of the axial potential within a channel can produce a lattice gas system where the weak mutual attraction between atoms in neighboring channels of a bundle induces condensation into a remarkably anisotropic phase with very low binding energy. We estimate the binding energy and critical temperature for 4He in this novel quasi-one-dimensional condensed state. At low temperatures, the specific heat of the adsorbate phase (fewer than 2% of the total number of atoms) greatly exceeds that of the host material.

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