Thermal Conductivity of PureHe3and of Dilute Solutions ofHe3in<

Abstract

The thermal conductivity K of pure He 3 and of two dilute solutions of He 3 in He 4 has been measured from 30 down to 5 mdeg K or below. For pure He 3 , KT increases with increasing temperature. For the dilute solutions at low enough temperatures, K is consistent with the T~i temperature dependence of a normal Fermi liquid, but the magnitudes of KT do not agree with values computed from an effective potential based on spin-diffusion coefficient measurements.We have measured at saturated vapor pressure the thermal conductivity both of pure liquid He 3 and of the same two dilute solutions of He 3 in He 4 for which measurements of specific heat, spin-diffusion coefficient, and magnetic susceptibility have already been reported. 1 The results relate to the question of the anomalous behavior of pure He 3 at low temperatures 2 ' 3 and to the effective interactions between He 3 quasiparticles in the dilute solutions. 4

Weak3He Pairing in3He-He(II) Mixtures

“…The predicted temperature dependence of Landau's Fermi liquid parameters, namely, the diffusion coefficient (D ∼ T −2 ), the thermal conductivity (κ ∼ T −1 ) and the viscosity (η ∼ T −2 ) at T T F , was confirmed by Anderson et al [41], Abel et al [42] and König and Pobell [43].…”

Review paper: Heat transfer between liquid helium and solids below 100 mK

“…* However, this is not the same as concluding that the boundary resistance showed no anomaly, since one of the important conclusions from the comparison of experiment with theory is that for the sintered powder samples below 20 mK the measured resistance is far smaller than the expected resistance between the 4He phonons and the 3He quasiparticles within the mixture (see Figs. [33][34][35]. It is very unlikely that the heat could flow directly from the metal to the quasiparticle excitations, because of the very large acoustic mismatch and the negligible magnetic coupling.…”

Thermodynamic properties of He3-He4 solutions with applications to the He3-He4 dilution refrigerator

“…The uncertainty in V(k), however, is such that the difference in the two results for (-E -L°)/R is inconsequential [19,21].…”