2-Phonon Absorption By The Real Squashing Mode In Superfluid He-3-B

Title2-Phonon Absorption By The Real Squashing Mode In Superfluid He-3-B
Publication TypeJournal Article
Year of Publication1991
AuthorsTorizuka, K., Pekola J. P., Manninen A. J., Kyynarainen J. M., and McKenzie Ross H.
JournalPhysical Review Letters
Volume66
Issue24
Pagination3152–3155
AbstractWe have observed in superfluid H-3-B 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+, f(signal) + f(pump) = f(rsq) (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.