Published June 1999 | Version v1
Journal article Metadata-only

High-resolution neutron-scattering study of the roton in confined superfluid 4He

Creators

  • 1. Department of Physics, University of Liverpool, Liverpool L69 7ZE (United Kingdom)
  • 2. Institut Laue-Langevin, Boite Postale 156, 38042 Grenoble, Cedex 9 (France)
  • 3. Centre de Recherches sur les Tres Basses Temperatures-CNRS, Boite Postale 166, 338042 Grenoble, Cedex 9 (France)
  • 4. Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802 (United States)
  • 5. National Institute of Science and Technology, Gaithersburg, Maryland 20899 (United States)
  • 6. Los Alamos National Laboratory, Lujan Center, LANSCE-12, Mail Stop H805, Lost Alamos, New Mexico 87545 (United States)

Description

We report high-resolution neutron inelastic-scattering measurements of the roton energy and linewidth of superfluid 4He confined in 95% porosity aerogel glass for temperatures 0.08<T<1.2 K. The confined roton line shape can be described well by a damped harmonic oscillator (DHO) function, as in the bulk. The energy of the confined roton is essentially temperature independent over this temperature range. The roton linewidth does not exhibit a finite width of greater than 0.1 μeV at low temperature. This result is in contrast to previous measurements carried out at lower resolution. copyright 1999 The American Physical Society

Additional details

Publishing Information

Journal Title
Physical Review. B, Condensed Matter
Journal Volume
59
Journal Issue
21
Journal Page Range
p. 13588-13591
ISSN
0163-1829
CODEN
PRBMDO

INIS

Country of Publication
United States
Country of Input or Organization
United States
INIS RN
30038321
Subject category
S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
Descriptors DEI
HELIUM 4; LINE WIDTHS; NEUTRON DIFFRACTION; ROTONS; SUPERFLUIDITY
Descriptors DEC
COHERENT SCATTERING; DIFFRACTION; EVEN-EVEN NUCLEI; HELIUM ISOTOPES; ISOTOPES; LIGHT NUCLEI; NUCLEI; QUASI PARTICLES; SCATTERING; STABLE ISOTOPES