Two-phonon absorption by the real squashing mode in superfluid 3B

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Journal Title
Journal ISSN
Volume Title
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
1991
Major/Subject
Mcode
Degree programme
Language
en
Pages
3152-3155
Series
Physical Review Letters, Volume 66, Issue 24
Abstract
We have observed in superfluid 3B two-phonon absorption, which is one of the nonlinear effects recently predicted by McKenzie and Sauls. The J=2+ real squashing mode was excited with two coincident sound pulses at the temperature T+, fsignal+fpump=frsq(T+), under 0, 2.7, and 3.5 bars pressure. The heights of the attenuation peaks scale almost linearly with the energy of the higher-intensity wave, in qualitative agreement with the theory. Furthermore, a satellite peak appears even in zero magnetic field, which originates from the reflected wave.
Description
Keywords
superfluids, two-phonon absorption, zero magnetic fields
Other note
Citation
Torizuka, K. & Pekola, Jukka & Manninen, A. J. & Kyynäräinen, J. M. & McKenzie, R. H. 1991. Two-phonon absorption by the real squashing mode in superfluid 3B. Physical Review Letters. Volume 66, Issue 24. P. 3152-3155. ISSN 0031-9007 (printed). DOI: 10.1103/physrevlett.66.3152.