Effects of helium on two-level systems in porous Vycor glass

Journal Article · Mon May 14 04:00:00 EDT 1984 · Phys. Rev. Lett.; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.52.1790· OSTI ID:6622304

Beamish, J R; Hikata, A; Elbaum, C

From sound-velocity measurements we found that the presence of helium in the pores of Vycor increased the relaxation rates of two-level systems in the glass. Superfluid /sup 4/He caused a much larger increase than either solid /sup 4/He or liquid /sup 3/He. The results are interpreted in terms of additional thermal phonons in the helium, with fourth-sound modes possibly causing the faster relaxation for superfluid /sup 4/He.

• Research Organization: Metals Research Laboratory and Department of Physics, Brown University, Providence, Rhode Island 02912
• OSTI ID: 6622304
• Journal Information: Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 52:20; ISSN PRLTA
• Country of Publication: United States
• Language: English

Related Subjects

640450* -- Fluid Physics-- Superfluidity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AUGMENTATION
DATA
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
FOURTH SOUND
FREQUENCY RANGE
GLASS
HELIUM 3
HELIUM 4
HELIUM ISOTOPES
INFORMATION
ISOTOPES
LATTICE VIBRATIONS
LIGHT NUCLEI
MATERIALS
MHZ RANGE
MHZ RANGE 01-100
MHZ RANGE 100-1000
NUCLEI
NUMERICAL DATA
PHONONS
POROUS MATERIALS
QUASI PARTICLES
RELAXATION
SOUND WAVES
STABLE ISOTOPES
SUPERFLUIDITY
ULTRASONIC WAVES
VELOCITY
VYCOR