Abstract
A new high-frequency cutoff for phonon propagation which lies beyond the well-known low-frequency cutoff due to anomalous dispersion is observed in phonon propagation experiments in liquid He4 using superconducting Sn and A1 tunnel-junction generators and detectors. The cutoff depends strongly on pressure and is interpreted as arising from a strong increase in phase space for phonon-roton scattering as normal dispersion in the phonon branch sets in.
Original language | English (US) |
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Pages (from-to) | 2406-2409 |
Number of pages | 4 |
Journal | Physical review letters |
Volume | 51 |
Issue number | 26 |
DOIs | |
State | Published - 1983 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy