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C. Pittman, T. Doiron, H. Meyer (1979)
Equation of state and critical exponents ofHe3and aHe3-He4mixture near their liquid-vapor critical pointPhysical Review B, 20
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T. Doiron, R. Behringer, H. Meyer (1976)
Equation of state of a3He-4He mixture near its liquid-vapor critical pointJournal of Low Temperature Physics, 24
R. Behringer, Ted Doiron, H. Meyer (1976)
Equation of state of3He near its liquid-vapor critical pointJournal of Low Temperature Physics, 24
Measurements of the thermal conductivity are reported for an 80%3He-20%4He mixture above the critical point along several isotherms and near-critical isochores, using the same techniques and apparatus described for a study of3He. Using again the assumption that the observed conductivity λ can be decomposed into a sum of a regular and a singular contribution λreg and λsing, it is shown that along two near-critical isochores, λsing diverges. In particular, along the isochore showing the largest λ at the phase transition, the divergence is nearly the same as for3He and can be roughly characterized by a simple power law (T-Tc)−ψ with Ψ≈0.58. This observation is contrary to predictions that foresee λsing→0 asT c is approached. The relaxation times characterizing the attainment of steady state conditions after switching the heat flux on and off show a similar behaviour as a function of reduced temperature as do those for pure3He. This result might indicate a substantial coupling between concentration and entropy diffusion. In the Appendix, the correlation length for3He nearT c is calculated from heat conductivity, viscosity, and specific heat data.
Journal of Low Temperature Physics – Springer Journals
Published: Nov 6, 2004
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