Specific heat of normal and superfluid3He |
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Authors: | T. A. Alvesalo T. Haavasoja M. T. Manninen |
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Affiliation: | (1) Low Temperature Laboratory, Helsinki University of Technology, Espoo, Finland |
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Abstract: | Extensive measurements of the heat capacity of liquid3He in the normal and superfluid phases are reported. The experiments range from 0.8 to 10 mK and cover pressures from 0 to 32.5 bar in zero magnetic field. The phase diagram of3He, based on the platinum NMR temperature scale, is presented. In the normal liquid at low pressures and near the superfluid transitionTc an excess specific heat is found. The effective massm* of3He is at all pressures about 30% smaller than the values reported earlier. The calculated Fermi liquid parameters F0 and F1 are reduced asm*/m, while the spin alignment factor (1 + Z0/4)–1 is enhanced from 3.1–3.8 to 4.3–5.3, depending on pressure. The specific heat discontinuity C/C atTc is forP = 0 close to the BCS value 1.43, whereas at 32.5 bar C/C is 1.90±0.03 in the B phase and 2.04±0.03 in the A phase, revealing distinctly the pressure dependence of strong coupling effects. The temperature dependence of the specific heat in the B phase agrees with a model calculation of Serene and Rainer. The latent heatL at the AB transition is 1.14±0.02 µJ/mole forP = 32.5 bar and decreases quickly as the polycritical point is approached; at 23.0 bar,L = 0.03 ± 0.02 µJ/mole.Work supported by the Academy of Finland. |
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