1991 年 60 巻 4 号 p. 1176-1180
Second-sound propagation is investigated in superfluid phases of 3He–4He mixtures in the presence of finely divided nonsuperfluid droplets. The attenuation is enhanced by diffusion of the entropy and the 3He component through the interface. At relatively high frequencies, it is proportional to the surface area density. At very low frequencies, we predict anomalous damping due to first-order phase transition periodically taking place at the interface. The second-sound speed is considerably decreased at low frequencies.
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