Decoupling of first sound from second sound in dilute 3He-superfluid 4He mixtures

T. S. Riekki, M. S. Manninen, J. T. Tuoriniemi

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)
121 Downloads (Pure)


Bulk superfluid helium supports two sound modes: first sound is an ordinary pressure wave, while second sound is a temperature wave, unique to superfluid systems. These sound modes do not usually exist independently, but rather variations in pressure are accompanied by variations in temperature, and vice versa. We studied the coupling between first and second sound in dilute He3-superfluid He4 mixtures, between 1.6 and 2.2 K, at He3 concentrations ranging from 0% to 11%, under saturated vapor pressure, using a quartz tuning fork oscillator. Second sound coupled to first sound can create anomalies in the resonance response of the fork, which disappear only at very specific temperatures and concentrations, where two terms governing the coupling cancel each other, and second sound and first sound become decoupled.

Original languageEnglish
Article number224514
Pages (from-to)1-7
JournalPhysical Review B
Issue number22
Publication statusPublished - 22 Dec 2016
MoE publication typeA1 Journal article-refereed

Fingerprint Dive into the research topics of 'Decoupling of first sound from second sound in dilute 3He-superfluid 4He mixtures'. Together they form a unique fingerprint.

Cite this