Acoustic studies of 3He–4He superfluid solution with variable concentration
В. А. МихеевPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovÉ. Ya. Rudavskiı̆Physicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovV. К. ChagovetsPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovG. A. SheshinPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov
ABI
Аннотация
Relative measurements of the first sound velocity have been made at temperatures above 25 mK in superfluid solutions whose concentration can be controlled directly during the experiment. A two-chamber cell in which the solution concentration can be varied from 0.88 to 6.2% 3He by varying the temperature of one of the chambers is described. It is shown that the concentration value determined from acoustic measurements is in agreement with the thermodynamic calculation based on the data on osmotic pressure and spouting pressure.
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