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Journal of Low Temperature Physics

, Volume 51, Issue 3–4, pp 227–248 | Cite as

History-dependent nonlinear dissipation in superfluid3He-A

  • R. Gay
  • M. Bagley
  • J. R. Hook
  • D. J. Sandiford
  • H. E. Hall
Article

Abstract

We have studied nonlinear dissipation in oscillatory flow of3He-A through 49-µm- and 17-µm-wide channels by means of torsion pendulum experiments at about 50 Hz. The observed effects are strongly history dependent; the dissipation at a given measuring amplitude is strongly increased if the sample is cooled through Tc while oscillating at large amplitude. Once a highly dissipative state has been created it does not noticeably decay below Tc, though a more dissipative state can be created below Tc by a period of sufficiently large-amplitude oscillation. The results are described semiquantitatively by a model based on the idea of superflow collapse by motion of the\(\hat l\) vector, with consequent orbital dissipation. The history dependence is introduced into this model by postulating the existence of surface singularities in the\(\hat l\) texture, the density of which is determined by the previous history of the helium.

Keywords

Helium Magnetic Material Large Amplitude Previous History Surface Singularity 
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.

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Copyright information

© Plenum Publishing Corporation 1983

Authors and Affiliations

  • R. Gay
    • 1
  • M. Bagley
    • 1
  • J. R. Hook
    • 1
  • D. J. Sandiford
    • 1
  • H. E. Hall
    • 1
  1. 1.Physics DepartmentUniversity of ManchesterManchesterEngland

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