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Anharmonic effects in ultrasonic propagation near the lambda transition of4He

โœ Scribed by H. Kwun; A. Hikata; C. Elbaum

Book ID
104625981
Publisher
Springer US
Year
1980
Tongue
English
Weight
324 KB
Volume
39
Category
Article
ISSN
0022-2291

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โœฆ Synopsis

Anharmonic effects are studied by measuring the temperature dependence of second harmonics of a IO-MHz ultrasonic wave generated near the A transition of pressurized liquid 4He. The anharmonic coupling coefficient C between the fundamental wave and the second harmonic is found to diverge as -[t[-1/t = (T/Tx)-i] near T~. A phenomenological relation is developed expressing C in terms of known relevant thermodynamic quantities. This relation accounts well for the experimental results.

๐Ÿ“œ SIMILAR VOLUMES

The velocity of second sound near the la
The velocity of second sound near the lambda transition in superfluid4He
โœ M.J. Adriaans; D.R. Swanson; J.A. Lipa ๐Ÿ“‚ Article ๐Ÿ“… 1994 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 163 KB

We report new high precision data on the velocity of second sound close to the lambda transition of 4He at the saturated vapor pressure. The second sound wave is detected by a powdered salt pill of copper ammonium bromide in direct contact with the liquid helium. With a thermometer noise of < 10-1ยฐK

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โœ Ken-ichi Tozaki; Akira Ikushima ๐Ÿ“‚ Article ๐Ÿ“… 1978 ๐Ÿ› Springer US ๐ŸŒ English โš– 718 KB

Attenuation of first sound has been measured in "SHe under saturated vapor pressure near the lambda temperature TA at frequencies to/ 2~r ranging from 10.2 to 271 MHz. The frequency dependence of the critical part of the attenuation is determined and the dynamic scaling hypothesis is examined. Above