Narayanamurti, V. ; Andres, K. ; Dynes, R. C. (1973) Dispersion and attenuation of superthermal "monochromatic" phonons in He II Physical Review Letters, 31 (11). pp. 687-690. ISSN 0031-9007
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Official URL: http://link.aps.org/doi/10.1103/PhysRevLett.31.687
Related URL: http://dx.doi.org/10.1103/PhysRevLett.31.687
Abstract
The propagation of phonons in He II at 0.1 K, in the frequency range (2 to 9)×1010 Hz, has been studied using superconducting Al-film generators. Such superthermal waves (hω>>kT) are shown to be long-lived propagating excitations in the liquid and to have negligible dispersion (group velocity varies by less than 0.5%). These measurements reveal that the current theories of phonon lifetimes in He II are inadequate.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to American Physical Society. |
| ID Code: | 30677 |
| Deposited On: | 23 Dec 2010 12:51 |
| Last Modified: | 11 Jun 2011 08:34 |
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