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Heat capacity of3He/4He mixtures

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Abstract

We measured the specific heat capacity of three dilute mixtures (2.6, 1.07, and 0.44%) of3He in4He and of pure4He. The4He contribution to the specific heat of the mixture is subtracted, leaving only the3He part. This is fitted to a theoretical expression over the whole temperature range from 10 to 700 mK. Assuming a dispersion relation of the form ε=ħ2 k 2(1+γk 2)/2m*, the fits yield the value of γ and the effective mass m* of each mixture. The average value of γ is −0.076±0.01 A2 and the effective mass in the limit of zero concentration is (2.23±0.02)m 3. These are compared to values deduced from other measurements.

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Authors and Affiliations

  1. Department of Physics, University of Nottingham, Nottingham, England

    J. R. Owers-Bradley, P. C. Main & R. M. Bowley

  2. Oxford Instruments, Osney Mead, Oxford, England

    G. J. Batey & R. J. Church

Authors
  1. J. R. Owers-Bradley
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  2. P. C. Main
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  3. R. M. Bowley
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  4. G. J. Batey
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  5. R. J. Church
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Owers-Bradley, J.R., Main, P.C., Bowley, R.M. et al. Heat capacity of3He/4He mixtures. J Low Temp Phys 72, 201–212 (1988). https://doi.org/10.1007/BF00682096

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  • DOI: https://doi.org/10.1007/BF00682096

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