The A-B Transition of Superfluid Helium-3 in Aerogel and the Effect of Anisotropic Scattering

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.

arXiv comment10 pages, 3 figures

References in corpus (6)

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• Models for Superfluid ${}^3$He in Aerogel
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• Observation of Coherent Precession of Magnetization in Superfluid 3He A-phase
• Chiral Phases of Superfluid 3He in an Anisotropic Medium
• Localized states and interaction induced delocalization in Bose gases with quenched disorder
• Stability of superfluid 3He-B in compressed aerogel
• Anisotropic phases of superfluid 3He in compressed aerogel
• Anisotropic Strong Coupling Effects on Superfluid 3He in Aerogels - Conventional Spin-Fluctuation Approach -
• The Effect of Magnetic Impurities on Superfluid ${}^3$He in Aerogel
• Modification of the 3He Phase Diagram by Anisotropic Disorder
• Ultrasound attenuation of superfluid ${}^3$He in aerogel
• Aerogel Waveplates
• Superfluid ${}^3$He in globally isotropic random media
• Stability of the A-like Phase of Superfluid 3He in Aerogel with Globally Anisotropic Scattering
• Grand Challenges in Quantum Fluids and Solids
• Ultrasound attenuation and a P-B-T phase diagram of superfluid 3He in 98% aerogel
• Anisotropic Aerogels for Studying Superfluid ${}^3$He
• Vortex core transitions in superfluid 3He in globally anisotropic aerogels
• Superfluid Phase Stability of ${}^3$He in Axially Anisotropic Aerogel
• Strong Coupling Correction in Superfluid ${}^3$He in Aerogel