1 - 10 of 11 articles
The theory of superconductivity in metallic superstructures with anisotropic electron spectrum is presented. It is shown that these structures, three-dimensional in the normal state, become layered or fibrous in the superconducting state. The upper critical magnetic field changes the temperature...
On single-phase B1 molybdenum carbide thin films prepared by the rf sputtering technique at substrate temperatures between 40 and 800°C isochronous annealing and He-irradiation investigations were performed. The transition temperature to superconductivityT
,the lattice parametera
0, and the...
Stoichiometric MoC has been calculated to have aT
of 16 K. To check this prediction, thin films of MoC
were prepared by sputtering both reactively with CH4 and using a composite Mo-C target. The preparation conditions were varied over wide ranges of composition, substrate temperature, Ar...
We have studied the effects of doping a Chevrel compound by investigating W
Mo6S8, wherex=0.00-0.20. An unusual peak in the dependence of the superconducting transition temperatureT
on the dopant concentration levelx has been observed. We explain the dependence ofT
onx in terms of...
We report the observation of the dc and ac Josephson effect and quasiparticle tunnelling in the high-temperature superconductor YBaCuO. The observation is made at 4.2 K. These effects were observed in a junction made by a niobium tip pressed against a high-T
sample of YBaCuO ceramic. We...
We calculate the magnetic susceptibility of submonolayer3He films. First, using the formulation of the equilibrium thermodynamic properties in terms of statistical quasiparticles, we obtain an expression for the magnetic susceptibility of dilute systems of particles interacting through a...
We have studied the enhancement of superconductivity due to a small concentration of local phonon impurities using a new method. The method combines diagrammatic perturbation theory and Monte Carlo simulation. This method allows us fully to take into account the retarded nature of the...
We investigate the dynamics and the phase diagram of Josephson junctions where the dissipation is due to quasiparticle tunneling. This system is formally equivalent to a one-dimensional X-Y model with easy axis and long-range interaction. It has a phase transition at a critical strength of the...
We report on the superconducting properties of a series of sputtered, amorphous Zr100−x
Cux (19≤x≤48) alloys. From the thermodynamic parameters, we conclude that there is a very good agreement with the BCS theory on the high-Cu-concentration side. When Zr content increases, and then the coupling...
Nonequilibrium phenomena in the two electrodes of high-current-density superconducting tunnel junctions are analyzed. The quasiparticle injection-induced enhancement of the energy gaps as well as of the critical current of one of the electrodes are considered. A graphic approach is employed to...
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