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Phys. Rev. Lett. 85, 4325–4328 (2000)

High-Frequency Acoustics of 3He in Aerogel

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R. Nomura1,*, G. Gervais1, T. M. Haard1, Y. Lee1,†, N. Mulders2, and W. P. Halperin1
1Department of Physics and Astronomy, Northwestern University, Evanston, Illinois, 60208
2Department of Physics and Astronomy, University of Delaware, Newark, Delaware, 19716

Received 30 May 2000; published in the issue dated 13 November 2000

High-frequency (∼15MHz) acoustics were performed on 3He in 98% porous silica aerogel using an acoustic cavity technique. Measurements of the sound attenuation in the normal Fermi liquid and superfluid display behavior quite different from the bulk owing to strong elastic scattering of quasiparticles. The transition from first-to-zero sound is completely obscured with a quasiparticle mean-free path estimated to be in the range of 200–300 nm. No collective mode attenuation peak was observed at or below the superfluid transition.

© 2000 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.85.4325
DOI:
10.1103/PhysRevLett.85.4325
PACS:
67.57.Pq, 67.55.Hc, 67.55.Lf

*Present address: Department of Condensed Matter Physics, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8551, Japan.

†Present address: Department of Physics, Stanford University, Stanford, California 94305.

 
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