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We have performed measurements of the temperature dependence of the magnetoresistance up to 9 T in bulk single crystals of UPt3 with the magnetic field along the b-axis, the easy magnetization axis. We have confirmed previous results for transverse magnetoresistance with the current along the...
We study the role played by the substrate–helium interaction in determining whether a 4He film is fluid or solid near monolayer completion. In order to glean information concerning the possible fluid-solid transition we calculate the equation of state as well as the behavior of phonons and...
In this paper we consider the problem of second sound propagation in a quasiparticle system which has a high level of anisotropy. The main aim of the research is to derive an exact expression for the second sound velocity in such a system, which is valid for any value of the velocity of the...
Previously, we carried out ultrasonic measurements for liquid 4He filled in a nanoporous glass (Gelsil), and observed an increase in the sound velocity due to decoupling of the superfluid component. At zero pressure, the superfluid transition temperature T
C is suppressed to 1.4 K from the bulk...
Silica aerogels are highly porous and very compressible materials. They are transparent and suitable for observation of the liquefaction process in them. We reported that capillary condensation of 4He in a very light aerogel with a porosity of 99.5% proceeded with two steps under a...
The development of adiabatic demagnetization refrigerators (ADR) over the last decade has resulted in significant improvements in performance and ease of use, including continuous operation, relatively high cooling power (30–35 μW at 100 mK), and cryogen-free operation. ADR systems are small,...
Activation energy for solid nucleation in overpressurized superfluid He-4 is calculated. On the basis of a model free energy of solidification of superfluid He-4, I found that both the critical shape of nucleus and the activation energy deviate from the standard model (the ‘thin wall’ model) as...
We observed that the Faraday waves were parametrically generated on a free surface of superfluid 4He. Our sample cell was supported by plate springs and had a permanent magnet on the top. It was oscillated by applying oscillating current to a superconducting coil. We prepared the sample cell...
A fountain effect is a common phenomenon in both 3He and 4He superfluids. Unique to superfluid 3He is the magnetic fountain effect, which has been used to determine the spin direction of the condensate in 3He A1 phase. Here we present a pressure driven fountain effect in A1 phase. The...
An anomalous temperature dependence of pressure in concentrated solid 3He-4He mixtures near the phase separation temperature T
is first found experimentally. Beginning with temperatures 50–70 mK above T
, as the temperature decreases and T
is approached, the pressure increases and...
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