1 - 10 of 12 articles
The electrical resistivity of the A15 compound Nb100−x
(20≤x≤28.9) is measured as a function of compositionx from room temperature to the superconducting transition temperatureT
The residual resistivity ρ0 is observed to be nearly independent of composition on the Nb-rich side of...
A possible high-T
superconductivity in a La-Sr-Nb-O film is reported. Onset of the resistive transition is at a temperature (T
) of 315 K, with a zero-resistance state at a temperature (T
) of 255 K. Diamagnetization of about 5% that of the pure Nb superconductor and a noticeable...
Consideration of the functional derivative of the zero-temperature reduced upper critical magnetic fieldh
c2(0) with electron-phonon spectral density α2
F(ω) suggests that its value can be maximized, for a given areaA under α2
F(ω), with the choice of a delta-function spectral density. We show...
The distribution of the maximum Josephson current in two-dimensional tunnel junctions is investigated both theoretically and experimentally. Measurements of the Josephson current density are performed using low-temperature scanning electron microscopy. Josephson current densities are calculated...
The temperature dependence of the thermal conductivity for a superconducting spin-glass is calculated, taking a short-range spin-spin interaction in a superconductor carrying a uniform flow. The presence of the short-range interaction between frozen spins gives rise to a strong depression in the...
Superfluid3He film flow over the rim of a copper beaker has been measured. The flow rate was measured as a function of temperature and as a function of depth of3He below the rim or film thickness at the rim. The critical current, calculated from the flow rate, varied as (1 −T/T
Superfluid3He in severely confined geometries is studied in the Ginzburg-Landau limit. Both A and B phases are analyzed in narrow slabs and in small cylinders. Physically measurable quantities include the superfluid density and the critical current, which are significantly suppressed by the...
A review and general discussion is given of the extent to which the earth's gravitational field affects critical dynamics experiments on liquid He I near the lambda line. It is argued that the measurements of the viscosity and of the ultrasonic attenuation are not significantly affected. The...
The temperature dependence of the maximum Josephson supercurrent is studied in ranges nearT
. The results are discussed in the framework of an approximate analysis for proximity systems based on the de Gennes theory and its application to several junctions.
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