Supercurrents and dynamic resistivities in periodic arrays of superconducting-normal contacts

The effect of structure on flux instability and on the superconducting properties of the Mo2Re3Bx–Mo3Re2Bxeutectic

“…At the same time, the eutectic can be regarded as a granular superconductor composed of large globules, or grains, of Mo 3 Re 2 B x and of filaments of the Mo 3 Re 2 B x and Mo 2 Re 3 B x phases, separated by a normal layer of metallic boron deposited at the interfaces. Thus, our sample may be classified as belonging to the S-N-S class of superconducting eutectics [23], where N is a normal metal and superconductors S and S' can differ with respect to the type of superconductivity, the critical temperature and other basic superconducting parameters. The existence of an interfacial layer of boron appears common in this family of ternary borides and has been found in, for example, W 7 Re 13 B and Mo 7 Re 13 B compounds [15,16].…”

“…Such networks were studied by Isakov et al [22], who found strong geometry effects and resonant tunnelling across Josephson contacts in GaSb-V 2 Ga 5 lamellar semiconductorsuperconductor eutectics. Dupart et al [23] observed clear interference patterns in supercurrents caused by periodic arrays of superconducting-normal contacts formed in a Pb-Sn eutectic. Structure and proximity effects have also been found to influence r.f.…”

A Description of the Transport Critical Current Behavior of Polycrystalline Superconductors Under the Applied Magnetic Field

“…Ceramic superconductor samples present a random network for the supercurrent path, with the critical current being limited by the weakest links in each path. This Josephson-type mechanism of conduction is responsible to the dependence of the critical current density on the magnetic field J c (H), as noted in several experimental studies [9][10][11]. On the other hand, the intragranular critical current is limited by an activated flux flow at high temperature and a high magnetic field [9,12,13].…”

Finite size arrays of proximity effect bridges

“…The analyses were done based on the de Gennes' model [8] for the dirty limit and the Kulik's model [9] for the clean limit. Dupart et al [10] made a one dimension band structure (*) Supported by the Swiss National Science Foundation.…”

“…Bardeen-Johnson (BJ) [9, 10] calculated the variation of the critical current Jc as a function of T. Their result well below Tc (In) can be written as where and the distance d* = dN + n03BE0, where dN is the width of the normal region (Au/In) between two In squares. When the temperature dependence of the gap is taken into account [10], d* is given by and the BJ expression (Equations (5) and (6)) is still valid. Using the values of [A(T = 0)/A(T)] for a BCS superconductor [13] it is possible to show that the correction is small in our case.…”