ABSTRACT
The mass flux, F, carried by as-grown solid (4)He in the range 25.6-26.3 bar rises with falling temperature, and at a concentration-dependent temperature, T(d), the flux decreases sharply within a few mK. We study F as a function of (3)He impurity concentration, χ. We find that T(d) is an increasing function of increasing χ. At temperatures above T(d) the flux has a universal temperature dependence and the flux terminates in a narrow window near a characteristic temperature T(h) ≈ 625 mK, which is independent of χ.
ABSTRACT
At a pressure of ~25.7 bar, the flux F carried by solid (4)He for T>100 mK depends on the net chemical potential difference between two reservoirs in series with the solid, Δµ, and obeys F~(Δµ)(b), where b≈0.3 is independent of temperature. At fixed Δµ the temperature dependence of the flux F can be adequately represented by F~-ln(T/τ), τ≈0.6 K, for 0.1≤T≤0.5 K. A single function F=F(0)(Δµ)(b)ln(T/τ) fits all of the available data sets in the range 25.6-25.8 bar reasonably well. We suggest that the mass flux in solid (4)He for T>100 mK may have a Luttinger liquidlike behavior in this bosonic system.
