Narayanamurti, V. ; Dynes, R. C. (1975) Ballistic phonons and the transition to second sound in solid 3He and 4He Physical Review B, 12 (5). pp. 1731-1738. ISSN 0163-1829
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Official URL: http://link.aps.org/doi/10.1103/PhysRevB.12.1731
Related URL: http://dx.doi.org/10.1103/PhysRevB.12.1731
Abstract
We have studied the propagation of ballistic phonons in solid 4He and 3He using the fast-heat-pulse technique. At sufficiently low temperatures (≤0.1 K), the intensities and velocities of the ballistic phonons are in good agreement with phonon focusing and ultrasonic data. The temperature dependence of the velocity and intensity of the slow transverse mode in 3He (molar volume range 23.7-24.5 cm3/mole) shows anomalous behavior in the vicinity of 0.2 K as this mode borrows weight from the higher lying branches. The implications of these measurements for specific-heat data are discussed. In addition, the numerical value of the measured second-sound velocity (which is independent of orientation) for 3He is shown to be in close agreement with that calculated using first-sound velocities determined by ultrasonics, but significantly different from vDebye/√3; the result in the isotropic case.
Item Type: | Article |
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Source: | Copyright of this article belongs to American Physical Society. |
ID Code: | 30671 |
Deposited On: | 23 Dec 2010 12:52 |
Last Modified: | 11 Jun 2011 08:31 |
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