Wave acoustics for propagation of ultrasound along a vortex array in superfluid 3He-A

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Journal Title
Journal ISSN
Volume Title
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
1992
Major/Subject
Mcode
Degree programme
Language
en
Pages
10536-10543
Series
Physical Review B, Volume 45, Issue 18
Abstract
A wave-acoustics theory has been developed to describe the propagation of zero sound parallel to vortex lines in rotating 3He-A. We show that a diffraction "shadow" is formed in which the wave amplitude is suppressed by interference around vortices. This phenomenon contributes to the experimentally observed effect of rotation on the sound amplitude and exceeds the attenuation at large core radii. The dependence of the diffraction contribution on the angular velocity changes drastically at the transition from vortices with a finite core to coreless vortices when the magnetic field is decreased to zero. We derive conditions for the applicability of the effective-medium theory and the classical geometrical acoustic method in describing sound propagation along vortices.
Description
Keywords
wave-acoustics theories, propagation of zero sound, vortices
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Citation
Sonin, E. B. & Torizuka, K. & Kyynäräinen, J. M. & Pekola, Jukka & Tvalashvili, G. K. 1992. Wave acoustics for propagation of ultrasound along a vortex array in superfluid 3He-A. Physical Review B. Volume 45, Issue 18. 10536-10543. ISSN 1098-0121 (printed). DOI: 10.1103/physrevb.45.10536.