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APS » Journals » Phys. Rev. Lett. » Volume 98 » Issue 22
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Phys. Rev. Lett. 98, 225301 (2007) [4 pages]

Ultrasound Attenuation of Superfluid 3He in Aerogel

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H. C. Choi, N. Masuhara, B. H. Moon, P. Bhupathi, M. W. Meisel, and Y. Lee*
Microkelvin Laboratory, Department of Physics, University of Florida, Gainesville, Florida 32611-8440, USA

N. Mulders
Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, USA

S. Higashitani, M. Miura, and K. Nagai
Faculty of IAS, Hiroshima University, Kagamiyama 1-7-1, Higashi-Hiroshima 739-8521, Japan

Received 31 January 2007; published 1 June 2007

We have performed longitudinal ultrasound (9.5 MHz) attenuation measurements in the B phase of superfluid 3He 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.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.225301
DOI:
10.1103/PhysRevLett.98.225301
PACS:
67.40.Mj, 67.40.Yv, 67.57.−z

*Electronic address: yoonslee@phys.ufl.edu

 
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