Advertisement

Journal of Low Temperature Physics

, Volume 15, Issue 5–6, pp 523–536 | Cite as

Phonon reflection at a cleaved sodium fluoride-helium film interface

  • A. R. Long
  • R. A. Sherlock
  • A. F. G. Wyatt
Article

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.

Unable to display preview. Download preview PDF.

References

  1. 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. 2.
    R. C. Dynes and V. Narayanamurti,Phys. Rev. B 6, 143 (1972).Google Scholar
  3. 3.
    W. Eisenmenger and A. H. Dayem,Phys. Rev. Lett. 18, 125 (1967).Google Scholar
  4. 4.
    C.-J. Guo and H. J. Maris,Phys. Rev. Lett. 29, 855 (1972).Google Scholar
  5. 5.
    W. H. Strehlow and E. L. Cook,Phys. Rev. 188, 1256 (1969).Google Scholar
  6. 6.
    S. J. Rogers,J. de Physique 33, C4–110 (1972).Google Scholar
  7. 7.
    J. Vallin, K. Marklund, J. O. Sikstrom, and O. Beckman,Ark. Fys. 32, 515 (1966).Google Scholar
  8. 8.
    O. Weiss,Z. Angew, Phys. 26, 325 (1969).Google Scholar
  9. 9.
    H. J. Trumpp, K. Lassmann, and W. Eisenmenger,Phys. Lett. 41A, 431 (1972).Google Scholar
  10. 10.
    A. R. Long,J. Phys. F (Metal Phys.), to be published.Google Scholar
  11. 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. 12.
    J. D. Achenbach,Wave Propagation in Elastic Solids (North-Holland, Amsterdam, 1973).Google Scholar
  13. 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. 14.
    R. C. Johnson and W. A. Little,J. Phys. Rev. 130, 594 (1963).Google Scholar
  15. 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

Authors and Affiliations

  • A. R. Long
    • 1
  • R. A. Sherlock
    • 1
  • A. F. G. Wyatt
    • 1
  1. 1.Department of PhysicsUniversity of NottinghamNottinghamEngland

Personalised recommendations