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

E. B. Sonin*, K. Torizuka, J. M. Kyynarainen, J. P. Pekola, G. K. Tvalashvili

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

A wave-acoustics theory has been developed to describe the propagation of zero sound parallel to vortex lines in rotating A3. 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.

Original languageEnglish
Pages (from-to)10536-10543
Number of pages8
JournalPhysical Review B
Volume45
Issue number18
DOIs
Publication statusPublished - 1 May 1992
MoE publication typeA1 Journal article-refereed

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