1 - 10 of 13 articles
We have measured the tunnelingI–V characteristics of Al-oxide-Al superconducting tunnel junctions in the presence of pair-breaking microwaves, ħω>2Δ. The junctions show an excess current below a bias of 2Δ/e. Photon-assisted tunneling (ħω>2Δ) may account for the excess current.
We present experimental results on the superconducting properties of Nb/Cu superlattices. The transition temperature of the superlattice implies a decrease in the transition temperature of single Nb films as a function of layer thickness. This is interpreted as due to the mean free path-induced...
The current-voltage characteristics of a new type of Josephson-like junction consisting of four superconductors in connection with a common region via separate weak links are investigated. This arrangement permits strong interaction and proximity effects to occur inside the composite junction,...
The magnetic field dependence of the maximum current of Fiske steps for long, one-dimensional, Josephson tunnel junctions has been measured. Experimental data obtained from junctions of various normalized lengths are presented; for slightly long junctions a comparison with the theory is made.
Electrical and superconducting properties of indium films condensed in a H2 atmosphere (pressurep
2=6×10−6 to 1.4×10−4 Torr) onto a substrate cooled with liquid helium are investigated. As hydrogen content is increased, a continuous increase in residual resistivity ρ* is observed, permitting...
A study has been made of the enhancement of the critical current in superconducting aluminum microstrips by microwave radiation. The observed enhancement is compared to calculations based on the Eliashberg theory modified for application to critical current enhancement. Theory and experiment are...
A microscopic theory of superconductors containing a magnetically polarizable medium is given. By taking into account the Zeeman effect, we derive the crossover behavior from a second- to a first-order phase transition, the magnetization curve in the high-field region, and the magnetization jump...
We have calculated the equation of state for solid molecular tritium using a semiempirical approach, closely guided by experimental results for H2 and D2. TheT=0 K isotherm is calculated from a self-consistent phonon model of the free energy. Temperature effects are treated by the Mie-Grüneisen...
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