| Issue |
Europhys. Lett.
Volume 67, Number 5, September 2004
|
|
|---|---|---|
| Page(s) | 773 - 778 | |
| Section | Condensed matter: structure, mechanical and thermal properties | |
| DOI | https://doi.org/10.1209/epl/i2004-10125-6 | |
| Published online | 01 August 2004 | |
Roton and phonon linewidths in superfluid 4He
1
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
Received:
5
March
2004
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
1.93Å
Å-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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