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The influence of a magnetic field on the propagation of fourth sound in superfluid 3He is studied. The field and temperature dependences of the average superfluid density \-ϱ
/ϱ and fourth sound Q are measured. The field dependence of \-ϱ
/ ϱ is very different in a porous medium than...
Nuclear magnetization of solid 3He has been studied by static magnetization measurements from 10 mK down to 0.3 mK for molar volumes ranging from V = 24.14 to 21.02 cm3/mole in the bcc phase and from V= 19.83 to 19.26 cm3/mole in the hcp phase. In the bcc phase, both the antiferromagnetic...
Under the criterion that normal-superconducting (NS) boundaries are straight when the sample thickness is less than the coherence length, experimental conditions for superconducting lead and aluminum are investigated where Landau laminar intermediate state structures with straight NS boundaries...
Greywall has recently proposed a new temperature scale for the 3He melting curve thermometer. A reanalysis of the velocity of second sound in 3He-4He mixtures using the data of Greywall and Paalanen with this new temperature scale shows that the interaction between 3He quasiparticles is now...
An expression for the surface energy at the normal-superconducting boundaries of a laminar intermediate state structure is derived as a function of a
/δ, where a
s is the width of superconducting domains and δ the surface energy parameter. Numerical calculations show that the ratio δ/ξ (ξ is...
The phonon-impurity system of dilute solutions of 3He in 4He is studied experimentally and theoretically using an acoustic technique. The sound velocity and absorption measurements make it possible to identify the theoretically predicted new mechanism of phonon relaxation with anomalous...
The laws xm=xm(T=0)(1+β
T2) and xm=xm(B=0)(1+β
B2), giving the effects of temperature and magnetization on the maximum solubility of 3He in 4He, are derived using the theory of normal Fermi systems. The parameters β
are expressed in terms of measurable quantities, such as the...
A phenomenological study in d-spatial dimensions is presented for the coexistence of planar antiferromagnetism and type II superconductivity. In this approach critical temperatures in the range 30–100 K arise due to the proposed coupling of magnons and conduction electron pairs. We discuss some...
We have studied the effects of disorder in a series of Sn films quench-condensed onto cryogenically cooled substrates. We find a simple scaling of the conductivity with film thickness Σ ~ (d - d
)Ν, with Ν ≅ 0.85, and a metal-insulator transition near d
≅ 40–50 ». The superconducting...
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