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Transverse sound in liquid-3He-aerogel system
S Higashitani1, M Miura, T Ichikawa
1Faculty of Integrated Arts and Sciences, Hiroshima University, Kagamiyama 1-7-1, Higashi-Hiroshima 739-8521, Japan.
Physical Review Letters
|November 22, 2002
Summary
Transverse sound in liquid helium-3 (3He) within aerogel exhibits unique behavior due to liquid-aerogel friction. A new low-attenuation sound mode emerges, differing from pure liquid 3He.
Area of Science:
- Condensed Matter Physics
- Low-Temperature Physics
- Quantum Fluids
Background:
- Normal liquid 3He exhibits distinct acoustic properties.
- Aerogels introduce complex boundary conditions and interactions in confined fluids.
- Understanding quasiparticle interactions is crucial for fluid dynamics.
Purpose of the Study:
- To investigate the behavior of transverse sound in normal liquid 3He confined within aerogel.
- To analyze the impact of aerogel oscillations and liquid-aerogel friction on sound propagation.
- To characterize the newly observed low-attenuation transverse sound mode.
Main Methods:
- Utilizing the Landau transport equation for liquid 3He.
- Incorporating the simultaneous oscillation of the aerogel structure.
- Analyzing quasiparticle scattering by aerogel molecules.
Main Results:
- The presence of aerogel significantly modifies transverse sound propagation.
- Friction between liquid 3He quasiparticles and aerogel leads to coupled liquid-aerogel motion.
- A distinct low-attenuation transverse sound mode is identified in the coupled system.
- The high-temperature attenuation follows alpha proportional to T^-2, differing from pure 3He.
Conclusions:
- Aerogel immersion fundamentally alters transverse sound in liquid 3He.
- The coupled liquid-aerogel system supports a novel acoustic mode.
- The observed attenuation behavior deviates from predictions for pure liquid 3He, highlighting the role of aerogel interactions.