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- Publisher
- Springer Journals
- Copyright
- Copyright © 1997 by Plenum Publishing Corporation
- Subject
- Physics; Condensed Matter Physics; Characterization and Evaluation of Materials; Magnetism, Magnetic Materials
- ISSN
- 0022-2291
- eISSN
- 1573-7357
- DOI
- 10.1007/BF02396835
- Publisher site
- See Article on Publisher Site
Abstract
When liquid4He is condensed in porous aerogel glass (typical pore size ≈ 500 Å), many of the superfluid properties are significantly altered. Neutron inelastic scattering has been used to measure the collective phonon-roton excitations of liquid4He in this restricted geometry. Although at low temperature (1.3 K) the observed dispersion relation is identical to that of bulk4He, its temperature dependence is shown to be different. Previously unexplained superfluid fraction data are shown to be derivable from these microscopic measurements. An intrinsic broadening of the excitations associated with the restricted geometry is also present. Possible microscopic explanations for the unusual temperature variation of the collective excitation energies are discussed.
Journal
Journal of Low Temperature Physics – Springer Journals
Published: Apr 6, 2006