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The propagation of spin-entropy wave has been studied in
in magnetic fields up to 12 tesla and at a pressure of 22.9 bar. The superfluid fraction at T
extracted from the propagation velocity increases linearly with magnetic field and reduced temperature. The anomalous attenuation...
We report continuous-wave NMR measurements on superfluid
He contained inside high porosity aerogel at 3.24 MPa, in a 28.4 mT magnetic field, and down to 0.9 mK. Three different purities of
He were used: pure
He with enough
He to replace the first localized layer, and
The broken symmetry phase (BSP) transition in solid HD has been shown to be an example of quantum orientational melting. Anomalous features observed for the transition are a consequence of the symmetry properties of the system, namely, the fact that in HD all rotational states and transitions...
We present preliminary measurements of the dynamics of a moving A-B phase interface in superfluid
He at temperatures below 0.2T
We initially stabilise the interface at low temperatures with a shaped magnetic field. We can then move the interface in a controlled manner by applying small...
It is shown that the surface dimple in a metastable rotating superfluid film becomes unstable as the surface spinodal of the thick film is approached. The dimple ceases to exist when its free energy E
equals the excess free energy E
of a critical hole in the film, which indicates the...
We have studied the spreading of helium-4 on cesium substrates with random disorder. When the characteristic length scale of the disorder is of the order of 20 micrometers, we have been able to measure the roughness exponents of the contact line, and found that they are in agreement with...
Weak localization by vapor-atom scattering is studied for electrons on a helium surface. Dephasing times are measured as a function of electron density. The electron-electron collision time is determined. The dephasing mechanism is due to the motion of helium atoms.
We have developed a Magnetic Resonance Imaging (MRI) technique applicable for ultra low temperature physics. In contrast to conventional MRI for general use where a pulsed-field gradient method is commonly used, we used a steady-field gradient method to avoid an eddy current heating due to...
Sound modes in
He mixtures which arise out of the two-fluid equations are made up up a vector convective flow and scalar temperature changes. A method for modeling nonlinear pulses of sound with geometric approximations to the vector and scalar components has recently been...
The distribution of thermally excited vortex loops near a superfluid phase transition is calculated. The number density of loops with a given perimeter is found to change from an exponential decay with increasing perimeter to algebraic decay as T
is approached from below, in agreement with...
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