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Article
Persistent Currents in Saturated Superfluid 4He Films on Rough Surfaces in the Presence of Third Sound Resonances
Journal of Low Temperature Physics (1977)
  • Robert Hallock, University of Massachusetts - Amherst
  • R. K Galkiewicz
  • K. L Telschow
Abstract
We have measured persistent current film flow through a long, stainless steel tube by Atkins oscillations between reservoirs at the tube ends and by Doppler-shifted third-sound resonances within the saturated film. Qualitatively the surface roughness is observed to both raise the Atkins oscillation frequency and lower the third-sound phase velocity from that expected for an ideal surface but otherwise has little effect on the motion. The third-sound resonance frequencies are shown to shift with the square of the persistent current velocity by an amount predictable using two-fluid hydrodynamics. The presence of the third sound does not affect the stability of the persistent currents in these thick films. The third-sound phase velocity is observed to have a temperature dependence consistent with (thetas/theta)1/2(1 + TS/L) as predicted by Bergman
Disciplines
Publication Date
1977
Citation Information
Robert Hallock, R. K Galkiewicz and K. L Telschow. "Persistent Currents in Saturated Superfluid 4He Films on Rough Surfaces in the Presence of Third Sound Resonances" Journal of Low Temperature Physics Vol. 26 (1977)
Available at: http://works.bepress.com/robert_hallock/30/