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

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 ad...

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Veröffentlicht in:	Phys. Rev. Lett.; (United States) 1984-05, Vol.52 (20), p.1790-1793
Hauptverfasser:	BEAMISH, J. R, HIKATA, A, ELBAUM, C
Format:	Artikel
Sprache:	eng
Schlagworte:	AUGMENTATION Boson degeneracy and superfluidity of 4he CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY Condensed matter: structure, mechanical and thermal properties DATA EVEN-EVEN NUCLEI EVEN-ODD NUCLEI Exact sciences and technology 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 Physics POROUS MATERIALS Quantum fluids and solids liquid and solid helium QUASI PARTICLES RELAXATION SOUND WAVES STABLE ISOTOPES 640450 > Fluid Physics-- Superfluidity SUPERFLUIDITY ULTRASONIC WAVES VELOCITY VYCOR
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Zusammenfassung:	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.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.52.1790