Acoustic spectroscopy of superfluid He-3 in aerogel

Authors
Golov, A Geller, DA Parpia, JM Mulders, N
Citation
A. Golov et al., Acoustic spectroscopy of superfluid He-3 in aerogel, PHYS REV L, 82(17), 1999, pp. 3492-3495
Citations number
20
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
82
Issue
17
Year of publication
1999
Pages
3492 - 3495
Database
ISI
SICI code
0031-9007(19990426)82:17<3492:ASOSHI>2.0.ZU;2-8
Abstract
Liquid He-3 in 98%-porous aerogel simultaneously possesses properties of a disordered p-wave superfluid and an elastic solid. We have observed two sou nd modes of superfluid He-3 in aerogel. The first (fast) sound is a compres sion wave, and the second (slow) sound is the out-of-phase oscillation of t he superfluid and the normal component that is coupled to the elastic acrog el matrix. A measurement of the slow sound velocity allows an accurate dete rmination of the superfluid fraction.