Third Sound in Dilute 3He–4He Mixture Films Adsorbed on Nuclepore

Abstract
We present measurements of the change in the square of the third sound speed, δC3 2, following the addition of small amounts of 3He, d3, to a 4He film of thickness d4 adsorbed on Nuclepore. For d4=2.8 layers and 0≤d3≤.09 layers δC3 2 is a linear function of d3. For d3=.09 layers and 2.8≤d4≤5.3 layers δC3 2/d3 has an unexpected minimum as a function of d4. Comparisons to δC3 2 on glass will be made.

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