Abstract
Extensive measurements of the heat capacity of liquid 3 He 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 of 3 He, based on the platinum NMR temperature scale, is presented. In the normal liquid at low pressures and near the superfluid transitionT c 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 ΔC/C atT c is forP = 0 close to the BCS value 1.43, whereas at 32.5 bar ΔC/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.
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