Third-Sound Resonance

14 September 1970

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 25 (11) , 711-714
https://doi.org/10.1103/physrevlett.25.711

Abstract

We have obtained a thermodynamic state of thin helium films which permits precision measurements of their properties. Third-sound resonances indicate a cutoff for the propagation of third sound in these films. This cutoff is accompanied by an exponential rise in the dc thermal resistance of the helium film which indicates the formation of high-energy excitations of 0.08 eV. The dissipation at resonance is consistent with Bergman's theory for hydrodynamic dissipation of third sound.

Keywords

This publication has 11 references indexed in Scilit:

Phonon Interference in Thin Films of Liquid Helium
Physical Review Letters, 1970
Temperature Dependence of the Superfluid Healing Length
Physical Review Letters, 1969
Third Sound and the Onset of Superfluidity in Unsaturated Helium Films
Physical Review B, 1969
Order-Parameter Fluctuations and the Onset of Superfluidity in Thin ${He}^{4}$ Films
Physical Review Letters, 1969
Superfluidity Without Superflow in Unsaturated Helium Films
Physical Review Letters, 1969
Superflow in Helium Films: Third-Sound Measurements
Physical Review Letters, 1969
Adsorption and Specific-Heat Studies of Monolayer and Submonolayer Films of ${He}^{3}$ and ${He}^{4}$
Physical Review B, 1968
Third Sound in Adsorbed Superfluid Films
Physical Review Letters, 1968
Temperature Dependence of the Superfluid Density in He II Near $T_{λ}$
Physical Review Letters, 1966
Third and Fourth Sound in Liquid Helium II
Physical Review B, 1959