Anomalous Attenuation of Transverse Sound in 3He

Abstract

We present the first measurements of the attenuation of transverse sound in superfluid 3He-B. We use fixed path length interferometry combined with the magneto-acoustic Faraday effect to vary the effective path length by a factor of two, resulting in absolute values of the attenuation. We find that attenuation is significantly larger than expected from the theoretical dispersion relation, in contrast to the phase velocity of transverse sound. We suggest that the anomalous attenuation can be explained by surface Andreev bound states.

arXiv comment4 pages, 5 figures, accepted to Phys. Rev. Lett

References in corpus (7)

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• Thermodynamic properties of thin films of superfluid 3He-A
• Discovery of the Acoustic Faraday Effect in Superfluid 3He-B
• Surface Specific Heat of ${}^3$He and Andreev Bound States
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• Anomalous Damping of a Micro-electro-mechanical Oscillator in Superfluid ${}^3$He-B
• Multifaceted properties of Andreev bound states: Interplay of symmetry and topology
• Spin superfluidity and magnon BEC
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