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APS » Journals » Phys. Rev. B » Volume 72 » Issue 9
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Phys. Rev. B 72, 094519 (2005) [4 pages]

A-B transition of superfluid 3He in aerogel and the effect of anisotropic scattering

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C. L. Vicente1, H. C. Choi2, J. S. Xia1, W. P. Halperin3, N. Mulders1, and Y. Lee1,2,*
1National High Magnetic Field Laboratory, Gainesville, Florida 32611-8440
2Department of Physics, University of Florida, Gainesville, Florida 32611-8440
3Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208
4Department of Physics, University of Delaware, Newark, Delaware 19716

Received 27 April 2005; published 29 September 2005

We report the results of high-frequency acoustic shear impedance measurements on superfluid 3He confined in 98% porosity silica aerogel. Using 8.69 MHz continuous wave excitation, we measured the acoustic shear impedance as a function of temperature for the sample pressures of 28.4 and 33.5 bar. We observed the A-B transition on warming in zero magnetic field. Our observations show that the A and B phases in aerogel coexist in a temperature range of about 100 μK in width. We propose that differences in the relative stability of the A and B phases arising from anisotropic scattering can account for our observations.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.72.094519
DOI:
10.1103/PhysRevB.72.094519
PACS:
67.57.−z, 62.60.+v, 64.60.My

*Email address: yoonslee@phys.ufl.edu

 
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