Transport mechanisms in a microparticle conductor

Author

Ashkin, M. ; Beasley, M.R.

Author_Institution

Westinghouse Electric Corp. R&D Center, Pittsburgh, PA

Volume

23

Issue

2

fYear

1987

fDate

3/1/1987 12:00:00 AM

Firstpage

1367

Lastpage

1371

Abstract

Transport properties of the microparticle superconductor described in the companion paper are represented by a percolative network of Josephson-coupled particles. Microparticle composite wires that have the best critical currents have resistivity ratios >1, suggesting that metallic conduction dominates and coupling occurs via weak links. The experimental jcis proportional to 1/ρeff, where 1/ρeff is the effective normal resistivity, in a qualitative analogy to a published relation calculated for a 3D percolative superconductor. The upper limit to jcis estimated taking into account percolation and flux pinning. Using an approximate theory for a percolative network this upper limit is expected to be $j_{c} \\siml 0.05 J_{\\max }$ , where $j_{\\max }$ is the critical current density in a perfect lattice of dirty weak links.

Keywords

Superconducting filaments/wires; Conductivity; Conductors; Critical current; Critical current density; Electrical resistance measurement; Lattices; Multifilamentary superconductors; Nearest neighbor searches; Research and development; Superconducting filaments and wires;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.1987.1065103

Filename

1065103