Nonlinear acoustical investigations of 3He-B near the two-phonon pair breaking edge

A. J. Manninen, K. Torizuka, A. V. Babkin, J.P. Pekola

Research output: Contribution to journalArticleScientificpeer-review


We report on experiments using energetic ultrasound pulses on superfluid 3He-B. Near the two-phonon pair breaking edge, at hf=Δ(T), an anomaly in ultrasonic attenuation has been detected. This feature grows with increasing acoustical intensity, and a new peak develops in the attenuation spectrum. The anomaly, coupling nonlinearly to ultrasound, can be observed also in the phase velocity of sound; in a magnetic field the anomaly splits to at least three features.

Original languageEnglish
Pages (from-to)765-766
Number of pages2
JournalPhysica B: Physics of Condensed Matter
Issue numberPART 1
Publication statusPublished - 2 Feb 1994
MoE publication typeA1 Journal article-refereed


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