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Phys. Rev. Lett. 90, 195301 (2003) [4 pages]

Sound Propagation in Coexistent Bose and Fermi Superfluids in Aerogel

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G. Lawes1,*, A. I. Golov2, E. Nazaretski1, N. Mulders3, and J. M. Parpia1
1Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York, USA
2Department of Physics and Astronomy, Manchester University, Manchester, United Kingdom
3Department of Physics and Astronomy, University of Delaware, Newark, Delaware, USA

Received 1 November 2001; revised 31 March 2003; published 12 May 2003

We report the first observation of longitudinal sound propagation in three dimensionally distributed Bose and Fermi superfluids in an acoustic investigation of phase separated 3He-4He mixtures confined to aerogel. At mK temperatures, this inhomogeneous system exhibits simultaneous 3He and 4He superfluidity leading to two “slow modes” along with the conventional sound mode. We also infer the superfluidity of isolated bubbles of pure 3He in a large 4He concentration sample.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.90.195301
DOI:
10.1103/PhysRevLett.90.195301
PACS:
67.60.–g, 47.37.+q, 67.57.De

*Current address: Los Alamos National Laboratory, Los Alamos, NM 87545.

 
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