1 - 10 of 14 articles
The dependence of pair density on pair velocity is used to formulate a simple model of the total current in a superconducting weak link. The model implies a phase-dependent conductivity and predicts its temperature variation, gives a kinematic description of the Josephson oscillations, and...
Nuclear magnetic relaxation times and their anisotropy with respect to field direction are computed for adsorbed monolayer and submonolayer
He films. We considerT
for fluid and solid systems with motion via diffusion and tunneling, respectively, andT
for the rigid lattice system....
It was found that very carefully prepared Na crystals gave quite large-amplitude de Haas-van Alphen oscillations, as if little or none of the metal had undergone the martensitic transformation in cooling to liquid helium temperatures. Detailed study of the absolute amplitude and the harmonic...
The temperature and angular dependences of upper critical fieldsH
have been measured for several 2H-NbSe2 single crystals by use of an electrical conduction method in magnetic fields up to 150 kOe. As the temperature approaches the transition temperatureT
, the value ofH
We report transverse cw NMR measurements on the superfluid phases of3He at temperatures between 3 and 0.7 mK. Nuclear demagnetization of copper was used for refrigeration. For thermometry we employed pulsed NMR on platinum powder immersed in the liquid. The measurements on3He were carried out in...
The superconducting transition temperature of crystalline and amorphous cadmium doped with dilute Mn atoms was measured. In the first case the initial depression ofT
as function of concentration isdT
/dc=5.4 K/at % and in the second casedT
/dc=2.65 K/at %. Both systems show non linear...
Neutron diffraction experiments have been performed on three Nb-13% Ta specimens in order to obtain information about the distribution of transport currents in type II superconductors. For sample one, which had the lowest pinning strength, it was concluded that most of the transport current was...
We present measurements of the mobility of positive and negative ions trapped on vortex lines in pure4He and dilute3He-4He solutions over the temperature range 1.6>T>0.3 K. In pure4He below about 0.7 K, we observe several new effects not seen at higher temperatures and not easily explained with...
The stationary current distribution in Josephson tunnel junctions is discussed within the framework of an approximate linear analysis. It is shown that such an approach can provide very useful information also on the behavior of two-dimensional junctions. Self-limiting effects and the magnetic...
Measurements of the static dielectric constant ε and of the resulting polarizability αCM defined by the Clausius-Mosotti relation are reported for several molecular solids under conditions of quasiconstant density. The range of measurements was between 0.4 and about 15 K, and pressures up to...
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