Observation of dispersion in the J=2+ collective modes of B3 by nonlinear acoustic spectroscopy

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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
3725-3728
Series
Physical Review Letters, Volume 68, Issue 25
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.
Description
Keywords
superfluid 3He, ultrasound, collective modes, nonlinear acoustic spectroscopy
Other note
Citation
Manninen, A. J. & Alles, H. & Babkin, A. V. & Pekola, Jukka & McKenzie, R. H. 1992. Observation of dispersion in the J=2+ collective modes of B3 by nonlinear acoustic spectroscopy. Physical Review Letters. Volume 68, Issue 25. 3725-3728. ISSN 0031-9007 (printed). DOI: 10.1103/physrevlett.68.3725.