Third sound in thin {sup 3}He-{sup 4}He mixture films

Journal Article · Thu Apr 01 04:00:00 EST 1993 · Bulletin of the American Physical Society

OSTI ID:243821

Sheldon, P A; Sprague, D T; Alikacem, N ^[1]

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1. Univ. of Massachusetts, Amherst, MA (United States); and others

The authors report measurements of the frequency and damping of third sound for {sup 3}He-{sup 4}He mixture films adsorbed on a Nuclepore resonator for 30{le}T{le}600 mK. As a function of increasing temperature the third sound velocity is constant at low temperatures, then, with increasing temperature, decreases as {sup 3}He disolves into the film, and for higher temperatures, increases as the {sup 3}He evaporates from the film. These results are consistent with recent NMR measurements which probe the energetics of the {sup 3}He in the film. Comparisons between the excited state energy values obtained from third sound measurements with those obtained from NMR will be presented.

• OSTI ID: 243821
• Report Number(s): CONF-9304297--; CNN: Grant DMR 91-22348
• Journal Information: Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 2 Vol. 38; ISSN 0003-0503; ISSN BAPSA6
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BINARY MIXTURES
DAMPING
FILMS
FREQUENCY ANALYSIS
HELIUM 3
HELIUM 4
TEMPERATURE RANGE 0000-0013 K
THIRD SOUND
WAVE PROPAGATION