The A-B Transition of Superfluid Helium-3 in Aerogel and the Effect of Anisotropic Scattering
C. L. Vicente, H. C. Choi, J. S. Xia, W. P. Halperin, N. Mulders, Y. Lee
Abstract
We report the results of high frequency acoustic shear impedance measurement on superfluid helium-3 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 pressure 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 micro-Kelvin in width. We propose that the difference in the relative stability of the A and B phases, arising from anisotropic scattering, can account for our observations.
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