Absorption of second sound in superfluid He3–He4 mixtures
L. S. DikinaPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSRG. Ya. KotenevPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSRÉ. Ya. Rudavskiı̆Physicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR
ABI
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Absolute measurements of the coefficient of absorption of second sound in superfluid He3–He4 mixtures with concentrations of 0.5% to 10% He3 are carried out in the temperature range from 1.3 to 2°K. It is found that at sufficiently low temperatures the absorption of second sound decreases considerably as the He3 content increases, and its temperature dependence exhibits nonmonotonic behavior with a broad absorption minimum.
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