1 - 10 of 12 articles
Using a microscopic variational theory we calculate the binding energy of3He impurities in films of4He absorbed to a graphite substrate. Without adjustable parameters, we obtain excellent agreement with the experimental binding energies for the ground state of the3He impurity.
The velocity dependence of the energy barrier for vortex creation in microscopic apertures is determined. When compared to results from other laboratories, the energy barrier seems to be a universal function of velocity. This universality suggests that the vortex nucleation process is...
We have measured the nuclear specific heat Cn
and nuclear susceptibility χn
of In nuclei (I=9/2, μ=5.5μ
n) in the cubic intermetallic compound AuIn2 (Korringa constant κ=0.11 Ksec) in the normal conducting state at 30μK⩽10mK and 2mT⩽B⩽115 mT. Our data show a positive nuclear Weiss temperature...
The influence of the long-range interaction of two-level systems in dielectric glasses on the density of low-energy excitations and the dielectric properties is studied. The AC dielectric susceptibiliy is analyzed under rapid switching on the external DC electric field. The instantaneous...
We investigate the possibility of a large enhancement of the T = 0 finite solubility of3He in4He due to spin-polarization. The size of the effect depends on the fraction of3He atoms in the system. We present two different approaches for the limits of a small and a large number of3He atoms...
Critical current and resistance of a single grain boundary in bulk bicrystals of the oxide superconductor BaPb1−x
03 show a reentrant behavior in the temperature region below critical temperature of single crystal blocks. We established that the reentrant behavior is related to intrinsic...
We investigate the influence of3He admixture on the Doppler shift of different sounds in superfluid4He with internal motion. This influence proves to be very strong in the whole region of the nontrivial temperature behavior of the Doppler shift and implies in particular an unexpected...
We describe a simple method to study vortex dynamics that can determine or set an upper limit on the vortex mass. The specific heat of the vortex lattice in layered superconductors has a classical limit of 1 kB per pancake vortex if the vortex mass is zero. If the vortex mass mv is finite, a new...
Very dilute3He-4He solutions provide a model system for the study of the effects of magnetic polarisation. It was proposed by the Lancaster group1 that a “pumping” effect of3He should be observed under appropriate conditions in these solutions. In a strong magnetic field gradient, the3He should...
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