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Turbulence of Second Sound Waves in Superfluid 4He: Effect of Low-Frequency Resonant Perturbations.

Research output: Contribution to journalJournal article

Published

Journal publication date02/2008
JournalJournal of Low Temperature Physics
Journal number3-4
Volume150
Number of pages8
Pages394-401
Original languageEnglish

Abstract

We report the results of investigations of acoustic turbulence in a system of nonlinear second sound waves in a high-quality resonator filled with superfluid 4He. It was observed that subharmonics of a periodic driving force applied to the system may be generated via a parametric instability. We find that application of an additional low-frequency pumping to the turbulent system results in the generation of waves at combination frequencies of the driving forces and also leads to substantial changes in the energy spectrum of the acoustic oscillations.