Ultrasound attenuation of superfluid ${}^3$He in aerogel

Abstract

We have performed longitudinal ultrasound (9.5 MHz) attenuation measurements in the B-phase of superfluid ${}^3$He in 98% porosity aerogel down to the zero temperature limit for a wide range of pressures at zero magnetic field. The absolute attenuation was determined by direct transmission of sound pulses. Compared to the bulk fluid, our results revealed a drastically different behavior in attenuation, which is consistent with theoretical accounts with gapless excitations and a collision drag effect.

arXiv comment4 pages, 3 figures. Submitted to PRL

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Cited by in corpus (5)

• Impurity Effects of Aerogel in Superfluid ${}^3$He
• Spin-Nernst Effect in Time-Reversal-Invariant Topological Superconductors
• Knudsen-to-Hydrodynamic Crossover in Liquid 3He in a High-Porosity Aerogel
• Ultrasound attenuation and a P-B-T phase diagram of superfluid 3He in 98% aerogel
• Dissipation signatures of the normal and superfluid phases in torsion pendulum experiments with 3He in aerogel