Abstract
We present a unified description of the dynamic response of superfluid 4He using perturbation theory. We show that the characteristic features of the 4He inelastic neutron scattering spectra at T∼1 K can be fully described by considering only density fluctuations. We also discuss how the response changes when the temperature is raised through the superfluid phase to the normal-fluid phase, and we argue that these changes principally reflect the behavior expected because of the Bose statistics obeyed by all the 4He atoms rather than being effects of the depletion of the Bose condensate.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
REFERENCES
P. Kapitza, Nature 141, 74 (1938).
J.F. Allen and A.D. Misener,Nature 141, 75 (1938).
F. London, Nature 141, 643 (1938).
A.Einstein, Sitzungsber Berlin Preuss. Akad. Wiss. 3 (1925).
V.F. Sears, E.C. Svensson, P.Martel and A.D.B. Woods, Phys. Rev. Lett. 49 279 (1982).
A.F.G Wyatt, Nature391, 56 (1998).
P.E. Sokol in Bose-Einstein Condensation (eds. Griffin, A, Snoke, D.W. & Stringari, S.) p. 51 (Cambridge Univ. Press, 1995).
A. Griffin, Excitationsin a Bose-Condensed Liquid (Cambridge Univ. Press, 1993).
H.R. Glyde, Excitations in Liquidand Solid Helium (Oxford Univ. Press, 1994).
E.C. Svensson, W. Montfrooij, and I.M. deSchepper, Phys. Rev. Lett. 77, 4398 (1996); 80, 2017 (1998).
W. Montfrooij, E.C.Svensson, I.M. de Schepper and E.G.D. Cohen, J. Low Temp. Phys. 109, 577 (1997).
R.P. Feynman, Phys. Rev. 94, 262 (1954).
H.W. Jackson and E. Feenberg, Rev.Mod. Phys. 34, 686 (1962).
H.W. Jackson, Phys. Rev. A8, 1529 (1973).
C.C. Chang and C.E. Campbell, Phys. Rev. B13, 3779 (1976).
B.E. Clements, E.Krotscheck, J.A. Smith and C.E. Campbell, Phys. Rev. B47, 5239 (1993).
B.E. Clements, E. Krotscheck, C.J. Tymczak, Phys. Rev. B53, 12253, (1996).
V. Apaja and S. Saarela,Phys. Rev. B57, 5358 (1998) and references therein.
Deok Kyo Lee and Felix J. Lee,Phys. Rev. B11, 4318 (1975).
E. Manousakis and V.R. Pandharipande, Phys. Rev.B33, 150 (1986).
R.J. Donnelly, J.A. Donnelly and R.N. Hills, J. Low Temp. Phys. 44,471 (1981).
H.R. Glyde, M.R. Gibbs, W.G Stirling and M.A. Adams, Europhys. Lett. 43,422 (1998).
L.D. Landau and I.M. Khalatnikov, Zh. Eksp. Teor. Fiz. 19, 637(1949).
W.G. Stirling and H.R. Glyde, Phys. Rev. B41, 4224 (1990).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Montfrooij, W., Svensson, E.C. Superfluid 4He: Just a Very Cold Liquid?. Journal of Low Temperature Physics 121, 293–302 (2000). https://doi.org/10.1023/A:1017568722896
Issue Date:
DOI: https://doi.org/10.1023/A:1017568722896