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Journal of Low Temperature Physics

, Volume 126, Issue 5–6, pp 1515–1528 | Cite as

Mutual Friction in Superfluid 4He Near the λ-Line

  • K. Kuehn
  • G. Ahlers
Article
  • 22 Downloads

Abstract

We present experimental results for the thermal resistivity ρ of superfluid 4He along several isobars between saturated vapor pressure and the melting pressure. The measurements are for the temperature range 1−Tc(q)/Tλ<t<2×10−5 and the heat-flux range 3<q<70 μW/cm2. Here t≡1−T/Tλ, Tλ is the transition temperature in the limit of zero q, and T c is the transition temperature at finite q. The data suggest that the resistivity has an incipient singularity at Tλ which can be described by the power law ρ=(t/t0)−(mν+α) where t0=(q/q0) x . However, the singularity is supplanted by the transition to a more highly dissipative phase at Tc(q)<Tλ. The results suggest a mild dependence of mν+α on the pressure P, but can be described quite well by mν+α=2.76, x=0.89, and q0=q0, 0q0, 1P with q0, 0=401Wċcm−2 and q0, 1=−5.0Wċcm−2bars−1. The results imply that the Gorter–Mellink mutual friction exponent m has a value close to 3.46 and is distinctly larger than the classical value m=3.

Keywords

Transition Temperature Vapor Pressure Magnetic Material Thermal Resistivity Saturated Vapor 
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 2002

Authors and Affiliations

  • K. Kuehn
    • 1
  • G. Ahlers
    • 1
  1. 1.Department of Physics and Quantum InstituteUniversity of CaliforniaSanta BarbaraU.S.A

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