Mass flux and solid growth in solid 4He: 60 mK - 700 mK
نویسندگان
چکیده
منابع مشابه
Universal temperature dependence, flux extinction, and the role of 3He impurities in superfluid mass transport through solid 4He.
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 depend...
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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)l...
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We present neutron scattering measurements of the atomic momentum distribution n(k) in solid helium under a pressure p=41 bar (molar volume Vm=20.01+/-0.02 cm3/mol) and at temperatures between 80 and 500 mK. The aim is to determine whether there is Bose-Einstein condensation (BEC) below the critical temperature, Tc=200 mK, where a superfluid density has been observed. Assuming BEC appears as a ...
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تاریخ انتشار 2018