| Popis: |
We developed a method to measure the transmission coefficient of sound for the interface between the c- and d-phases of a phase-separated 3 He- 4 He liquid mixture at various temperatures and sound frequencies. From the data the kinetic growth coefficient of the interface ξ ω (T), describing phase-conversion processes at the interface, can be determined. We have extended the experiment down to 6 mK with sound of 9, 14, and 32 MHz. The main specific features observed are as follows: (i) ξ ω (T) shows a maximum at T maa (ω), (ii) above T max (ω), ξ ω (T) decreases with the increase of temperature as ξ ω (T) = Aω 5/2 /T 3 , and (iii) below T max (ω), ξ ω (T) decreases with the decrease of temperature and the frequency-dependence seems to disappear. That is, T max (ω) corresponds to the crossover temperature between the hydrodynamic and ballistic regimes for ξ ω (T). |
Full text from SpringerLink