Volume 67, Number 5, September 2004
|Page(s)||773 - 778|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 August 2004|
Roton and phonon linewidths in superfluid 4He
Max-Planck-Institute for Solid State Research - D-70569 Stuttgart, Germany
2 FRM-2 - D-85747 Garching, Germany
3 TU Darmstadt, Institut für Festkörperphysik - D-64289 Darmstadt, Germany
4 Hahn-Meitner-Institut, BENSC - D-14109 Berlin, Germany
Accepted: 25 June 2004
We present high-resolution data of the energy widths Γ of elementary excitations in superfluid on the phonon branch 0.3Å Å-1 and both the energies and the widths on the roton branch 1.93ÅÅ-1 at . In both Q-regions a broadening of Γ is clearly observed. The roton energies and group velocities observed in the present experiment are significantly smaller than those reported from previous experiments.
PACS: 61.12.Ex – Neutron scattering (including small-angle scattering) / 67.40.Db – Quantum statistical theory; ground state, elementary excitations
© EDP Sciences, 2004
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