Observation of dispersion in the J=2+ collective modes of 3B by nonlinear acoustic spectroscopy

A. J. Manninen*, H. Alles, A. V. Babkin, J. P. Pekola, R. H. McKenzie

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)
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Abstract

Parametric excitation yields new results, which cannot be obtained by conventional linear spectroscopy, on the collective modes in superfluid B3. In our ultrasonic experiments, performed in a chamber with four quartz crystals, we have excited the real squashing (J=2+) modes by two simultaneous sound waves which are mutually either parallel, orthogonal, or antiparallel. Qualitatively these results are in agreement with the theoretical dispersion relation of the J=2+ modes, and quantitatively we have been able to extract the collective-mode velocities from the line splittings in zero magnetic field.

Original languageEnglish
Pages (from-to)3725-3728
Number of pages4
JournalPhysical Review Letters
Volume68
Issue number25
DOIs
Publication statusPublished - 22 Jun 1992
MoE publication typeA1 Journal article-refereed

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