Fizika Nizkikh Temperatur: Volume 46, Number 11 (November 2020), p. 1247-1252 ( to contents , go back )
Propagation of a second sound waves in a resonator with a deuterium gel
V.B. Efimov, A. N. Izotov, and L. P. Mezhov-Deglin
Institute of Solid State Physics RAS, Chernogolovka, Russia
Received July 15, 2020, published online September 21, 2020
Investigations of the propagation of the second sound waves were made in a resonator with the presence of a deuterium-helium gel. The technique was used in experiments for measuring the parameters of standing waves in the resonator in the presence or the absence of a gel. It is shown that the propagation of the second sound waves changes drastically in the presence of the gel: the attenuation of the waves increases sharply and their speed decreases. This behavior of the second sound velocity differs from the propagation of the waves of the second sound in aerogel with conditions of braking of the normal component and can be associated with changes in the properties of superfluid liquid in a limited geometry in a soft matter.
Key words: superfluid helium, second sound, impurity-helium gels, resonator.