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Experiments with3He quasiparticles in the collisionless regime. I. A direct measurement of the Fermi velocity by heat conduction

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Abstract

Measurements of the thermal conduction of liquid3He in the collisionless regime, where the mean free path of the thermal carriers is much greater than the channel diameter, allow a direct measurement of the carrier velocity. These experiments have been done using Vycor porous glass as the channel (average diameter ∼70 Å) at temperatures down to 16 mK. They show that the carrier velocity (∼43 m/sec) is that of quasiparticles rather than of bare3He atoms, whose velocity would be a factor of m*/m (∼3) greater, and thus confirm quite independently of any other measurement the validity of Landau quasiparticle theory. The data also strongly suggest a zero quasiparticle specular reflection coefficient, which allows an estimate to be made of the quasiparticle lifetime. This shows that the energy levels of quasiparticle states have a width more than ten times greater thankT at 20 mK. As an incidental result, a value for the low-temperature thermal conductivity of Vycor glass has been calculated.

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Authors and Affiliations

  1. The Physics Laboratory, University of Sussex, Falmer, Brighton, England

    D. S. Betts, D. F. Brewer & R. S. Hamilton

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  1. D. S. Betts
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  2. D. F. Brewer
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  3. R. S. Hamilton
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Betts, D.S., Brewer, D.F. & Hamilton, R.S. Experiments with3He quasiparticles in the collisionless regime. I. A direct measurement of the Fermi velocity by heat conduction. J Low Temp Phys 14, 331–347 (1974). https://doi.org/10.1007/BF00655338

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