Is Jcin Nb3Sn limited by grain-boundary flux-shear?

Author

Hughes, D. Dew

Author_Institution

Oxford University, Oxford, UK

Volume

Issue

fYear

1987

fDate

3/1/1987 12:00:00 AM

Firstpage

1172

Lastpage

1175

Abstract

It is postulated that flux-pinning by grain-boundaries may be avoided if flux can shear and flow down paths lying in grain-boundaries. The difference in flux-pinning behaviour between NbTi, $F_{p}\\alpha b(1-b)$ , and solid state reacted Nb3Sn, $F_{p}\\alpha b^{frac{1}{2}} (1-b)^{2}$ , arises from the different morphologies of their grain-structures. The boundaries, drawn out parallel to filament axes and direction of current flow in NbTi act as effective barriers to flux motion. The boundaries of grain produced by reaction in Nb3Sn provide paths along which flux can flow by grain-boundary shearing. An expression is developed for grain-boundary shearing which gives good agreement with experimental results.

Keywords

Superconducting materials; Conductors; Lattices; Lorentz covariance; Morphology; Niobium compounds; Niobium-tin; Shearing; Solid state circuits; Tin; Titanium compounds;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.1987.1064999

Filename

1064999

Link To Document

https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=1024011