Oscillations in the expansion of solid He-4 into vacuum
Year: 2005
Authors: Benedek G., Dalfovo F., Grisenti R.E., Kaesz M., Toennies J.P.
Autors Affiliation: Max-Planck-Institut fuer Stroemungsforschung,Goettingen, Germany;
Institut fuer Kernphysik der J. W. Goethe Universitaet, Frankfurt/Main, Germany;
Dipartimento di Scienza dei Materiali and INFM, Universita’ di Milano-Bicocca;
Dipartimento di Matematica e Fisica and INFM, Universita’ Cattolica, Brescia;
INFM BEC, Trento
Abstract: The particle flux through a micron-sized orifice into vacuum from a source chamber filled with solid He-4 exhibits a striking sequence of periodic bursts. The period increases (decreases) with pressure (temperature), vanishing at the melting point for temperatures above the upper lambda point at 1.76 K. The oscillations are attributed to a periodic collapse of the solid induced by the accumulation of excess vacancies injected at the orifice and the period provides information on vacancy diffusivity. Dramatic deviations from this behavior below 1.76 K suggest important modifications in the flow properties of solid He-4 induced by the excess vacancies.
Journal/Review: PHYSICAL REVIEW LETTERS
Volume: 95 (9) Pages from: 095301-1 to: 095301-4
KeyWords: solid 4HeDOI: 10.1103/PhysRevLett.95.095301ImpactFactor: 7.489Citations: 8data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2024-09-29References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here