Effect of surface solid on the propagation of sound through superfluid /sup 4/He in grafoil
The velocity and attenuation of sound propagating through superfluid /sup 4/He confined to Grafoil pores have been measured. The data are correlated with an adsorption isotherm of surface solid /sup 4/He, grown from the pressurized liquid phase. The adsorption isotherm was obtained simultaneously in the same cell. A definite relationship exists between changes of the acoustic properties and growth of the solid layer, as suggested by Maynard et al. The sound is sensitive not only to thickness changes, but also to structural phase transitions of the solid layer. The results imply that in contrast to bulk /sup 4/He, melting and freezing in thin solid layers is not a wavelike phenomenon. Insted it is proposed that coupling of sound to the surface is achieved through an excitation of a Rayleigh wave.
- Research Organization:
- Department of Physics, Technion, Haifa, Israel
- OSTI ID:
- 5737669
- Journal Information:
- J. Low Temp. Phys.; (United States), Journal Name: J. Low Temp. Phys.; (United States) Vol. 58:5; ISSN JLTPA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ADSORPTION
ATTENUATION
DATA
EVEN-EVEN NUCLEI
EXPERIMENTAL DATA
FLUIDS
FOURTH SOUND
HELIUM 4
HELIUM II
HELIUM ISOTOPES
INFORMATION
ISOTHERM
ISOTOPES
LIGHT NUCLEI
MATERIALS
NUCLEI
NUMERICAL DATA
PHASE TRANSFORMATIONS
POROUS MATERIALS
QUANTUM FLUIDS
RAYLEIGH WAVES
SEISMIC SURFACE WAVES
SEISMIC WAVES
SOLIDS
SORPTION
STABLE ISOTOPES
SUPERFLUIDITY
VELOCITY