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

Journal Article · Thu Sep 01 00:00:00 EDT 2005 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.72.094519· OSTI ID:20719404

Vicente, C L; Xia, J S; Mulders, N ^[1]; Choi, H C ^[2]; Halperin, W P ^[3]; Lee, Y ^[1]

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1. National High Magnetic Field Laboratory, Gainesville, Florida 32611-8440 (United States)
2. Department of Physics, University of Florida, Gainesville, Florida 32611-8440 (United States)
3. Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208 (United States)

We report the results of high-frequency acoustic shear impedance measurements on superfluid {sup 3}He 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 {mu}K 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.

• OSTI ID: 20719404
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 9 Vol. 72; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANISOTROPY
EXCITATION
GELS
HELIUM 3
IMPEDANCE
MAGNETIC FIELDS
MHZ RANGE
PHASE TRANSFORMATIONS
POROSITY
SCATTERING
SHEAR
SILICA
STABILITY
SUPERFLUIDITY
TEMPERATURE DEPENDENCE