Abstract
We have constructed a silver alloy cell to investigate low frequency sound propagation in 3He-filled aerogel at various magnetic fields. In this apparatus, two sound modes were observed in the superfluid phase. We observed both the first sound-like mode (fast mode) which is a compression wave also seen in the normal state and the second sound-like mode (slow mode) which is attributed to the out-of-phase oscillation of the superfluid and normal components of 3He clamped to the aerogel matrix. The values of Tc and ρs can be extracted from the analysis of these two modes. In addition, a Helmholtz resonance provides an in-situ signature of the bulk superfluid transition and allows us to also determine the bulk ρs. By measuring these quantities over a range of applied magnetic fields we hope to explore the P, T, H phase diagram of 3He in aerogel.
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