Superfluidity of {sup 4}He in nanosize channels
- Low Temperature Physics Laboratory, RIKEN, Hirosawa 2-1, Wako, Saitama 351-0198 (Japan)
Superfluid properties of {sup 4}He adsorbed in nanometer-size channels have been studied using torsional oscillators for several channel diameters ranging from 1.5 to 4.7 nm. Clear evidence that {sup 4}He exhibits superfluidity in channels larger than 1.8 nm is obtained. The superfluid transition in channels larger than 2.8 nm is well understood in terms of the finite-size Kosterlitz-Thouless transition, where the vortex unbinding mechanism plays an essential role. This vortex mechanism, however, should break down for channels narrower than the vortex core size (2.5{+-}1.2 nm). Indeed, features that are not expected on the basis of the finite-size Kosterlitz-Thouless theory are observed for channels smaller than 2.2 nm: strong suppression of the observed superfluid density and disappearance of the dissipation peak associated with the diffusive motion of the vortices.
- OSTI ID:
- 21052722
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 76, Issue 14; Other Information: DOI: 10.1103/PhysRevB.76.144503; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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