AB transition of superfluid He3 in aerogel and the effect of anisotropic scattering

C. L. Vicente, H. C. Choi, J. S. Xia, W. P. Halperin, N. Mulders, and Y. Lee
Phys. Rev. B 72, 094519 – Published 29 September 2005

Abstract

We report the results of high-frequency acoustic shear impedance measurements on superfluid He3 confined in 98% porosity silica aerogel. Using 8.69MHz continuous wave excitation, we measured the acoustic shear impedance as a function of temperature for the sample pressures of 28.4 and 33.5bar. We observed the AB 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 100μK 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.

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  • Received 27 April 2005

DOI:https://doi.org/10.1103/PhysRevB.72.094519

©2005 American Physical Society

Authors & Affiliations

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

  • *Email address: yoonslee@phys.ufl.edu

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Vol. 72, Iss. 9 — 1 September 2005

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