Abstract
The reflection coefficient of longitudinal 25-GHz phonons was measured at normal incidence on quartz-liquid He4 interfaces. For clean samples, close agreement with the Khalatnikov theory was found with no indication of anomalous transmission. Samples coated with 300- paraffin, however, showed a substantially lower reflection coefficient in contact with helium. This anomalous reduction was found to depend on the phonon intensity I as I-12, in good accord with the defect model for the Kapitza conductance.
| Original language | English |
|---|---|
| Pages (from-to) | 2317-2319 |
| Number of pages | 3 |
| Journal | Physical Review B |
| Volume | 26 |
| Issue number | 4 |
| DOIs | |
| State | Published - 1982 |