Picture of a sphere with binary code

Making Strathclyde research discoverable to the world...

The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs. It exposes Strathclyde's world leading Open Access research to many of the world's leading resource discovery tools, and from there onto the screens of researchers around the world.

Explore Strathclyde Open Access research content

Propagating phonons in liquid 4He

Wyatt, A.F.G. and Lockerbie, N.A. and Sherlock, R.A. (1989) Propagating phonons in liquid 4He. Journal of Physics: Condensed Matter, 1 (22). pp. 3507-3522. ISSN 0953-8984

Full text not available in this repository. (Request a copy from the Strathclyde author)

Abstract

at T approximately=0.1 K is studied as a function of pressure input power and propagation distance. Using a superconducting tunnel junction detector it is found that a single injected pulse can form two propagating pulses at low pressures but only one at high pressures. It is shown that three-phonon scattering can explain this behaviour. At low pressures, one group of phonons propagates ballistically while another group consists of strongly interacting phonons which travel at the ultrasonic velocity.