Phonon reflection at a cleaved sodium fluoride-helium film interface
Article
Received:
- 34 Downloads
- 30 Citations
Abstract
High-frequency phonons (hω/kB≳10 K) have been reflected on the solid side of a sodium fluoride-helium-4 interface. The reflectivity was measured as a function of helium film thickness and it was found that most of the change occurs below a pressure of 0.1 of the SVP at ∼1.1 K, when the helium film is a few atomic layers thick. The largest change in reflectivity occurs for transverse phonons, which travel along longer paths than the specularly reflected phonons. It is suggested that the incident phonons excite surface modes which desorb some of the surface bound helium atoms.
Keywords
Sodium Reflection Helium Film Thickness Magnetic Material
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
Preview
Unable to display preview. Download preview PDF.
References
- 1.G. L. Pollock,Rev. Mod. Phys. 41, 48 (1969); N. S. Snyder,Cryogenics 10, 89 (1970); L. J. Challis (to be published).Google Scholar
- 2.R. C. Dynes and V. Narayanamurti,Phys. Rev. B 6, 143 (1972).Google Scholar
- 3.W. Eisenmenger and A. H. Dayem,Phys. Rev. Lett. 18, 125 (1967).Google Scholar
- 4.C.-J. Guo and H. J. Maris,Phys. Rev. Lett. 29, 855 (1972).Google Scholar
- 5.W. H. Strehlow and E. L. Cook,Phys. Rev. 188, 1256 (1969).Google Scholar
- 6.S. J. Rogers,J. de Physique 33, C4–110 (1972).Google Scholar
- 7.J. Vallin, K. Marklund, J. O. Sikstrom, and O. Beckman,Ark. Fys. 32, 515 (1966).Google Scholar
- 8.O. Weiss,Z. Angew, Phys. 26, 325 (1969).Google Scholar
- 9.H. J. Trumpp, K. Lassmann, and W. Eisenmenger,Phys. Lett. 41A, 431 (1972).Google Scholar
- 10.A. R. Long,J. Phys. F (Metal Phys.), to be published.Google Scholar
- 11.C. H. Anderson and E. S. Sabisky, inPhysical Acoustics, Vol. 8, W. P. Mason and R. N. Thurston, eds. (Academic Press, New York, 1970), p. 1.Google Scholar
- 12.J. D. Achenbach,Wave Propagation in Elastic Solids (North-Holland, Amsterdam, 1973).Google Scholar
- 13.G. W. Farnell, inPhysical Acoustics, Vol. 6, W. P. Mason and R. N. Thurston, eds. (Academic Press, New York, 1970), p. 109.Google Scholar
- 14.R. C. Johnson and W. A. Little,J. Phys. Rev. 130, 594 (1963).Google Scholar
- 15.G. A. Toombs and L. J. Challis,J. Phys. C. (Solid State Phys.) 4, 1085 (1971).Google Scholar
Copyright information
© Plenum Publishing Corporation 1974