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) |
|---|---|
| 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