Superfluid density of thin /sup 4/He films adsorbed in porous Vycor glass

Journal Article · Sun Nov 01 04:00:00 EST 1981 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.24.5047· OSTI ID:5956116

Bishop, D J; Berthold, J E; Parpiat, J M; Reppy, J D

We have studied the superfluid density of thin superfluid /sup 4/He films absorbed in porous Vycor glass. At low temperatures we have used a third-sound technique to examine the Landau elementary excitations. We observed phonons with a T/sup 2/ temperature dependence and rotons with a 5-K energy gap. At higher temperatures we have examined the superfluid density in the critical region. The superfluid density follows a power law similar to that of bulk /sup 4/He with an exponent at the bulk value. We conclude that these effects are due to the three-dimensional geometry of the substrate.

• Research Organization: Laboratory of Atomic and Solid State Physics and the Materials Science Center, Cornell University, Ithaca, New York 14853
• OSTI ID: 5956116
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 24:9; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

640450* -- Fluid Physics-- Superfluidity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ADSORBENTS
ADSORPTION
DENSITY
EVEN-EVEN NUCLEI
FILMS
FLUIDS
HELIUM 4
HELIUM II
HELIUM ISOTOPES
ISOTOPES
LIGHT NUCLEI
NUCLEI
PHONONS
PHYSICAL PROPERTIES
QUANTUM FLUIDS
QUASI PARTICLES
ROTONS
SORPTION
STABLE ISOTOPES
SUPERFLUIDITY
THIRD SOUND
VYCOR