title: Condensation of helium in nanotube bundles
abstract: 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 wherein the weak mutual attraction between atoms in neighboring channels induces a transition to an anisotropic condensed phase. At low temperatures, the specific heat of the adsorbate phase (with fewer than 2% of the atoms) greatly exceeds that of the host.
authors.affiliation: Department of Physics, 104 Davey Laboratory, Penn State University, University Park, Pennsylvania 16802-6300, USA.
authors.initials: MW
authors.lastname: Cole
authors.initials: VH
authors.lastname: Crespi
authors.initials: G
authors.lastname: Stan
authors.initials: C
authors.lastname: Ebner
authors.initials: JM
authors.lastname: Hartman
authors.initials: S
authors.lastname: Moroni
authors.initials: M
authors.lastname: Boninsegni