The Re-Entrant Normal Flapping Mode in the Dipolar Boundary Layers of 3He-A

J. P. Pekola*, K. Torizuka, J. M. Kyynarainen, A. J. Manninen, W. Wojtanowski, G. K. Tvalashvili

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)

Abstract

Zero sound experiments on superfluid 3He-A at low pressures (<3 bar) and in strong magnetic fields (>0.3T) show an increase in the attenuation at low temperatures (6 0.4 mK) which has been a puzzle until the present experiment. Coupling of the re-entrant normal flapping (NFL) mode to zero sound in a geometry where sound propagates in the direction of the magnetic field is shown to arise from a boundary layer at the walls whose thickness is about the dipolar coherence length D, of 3He-A. We estimate the value oft; at low temperatures and at low and intermediate pressures. We have also studied the nonlinearity of sound propagation near the NFL mode and found a reversal of it when passing the mode.

Original languageEnglish
Pages (from-to)155-160
Number of pages6
JournalEPL
Volume13
Issue number2
DOIs
Publication statusPublished - 1990
MoE publication typeA1 Journal article-refereed

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