Flux pinning for in situ prepared superconducting composites

Journal Article · Fri Jan 01 04:00:00 EST 1982 · Adv. Cryog. Eng.; (United States)

DOI:https://doi.org/10.1007/978-1-4613-3542-9_31· OSTI ID:6205874

Sue, J J; Finnemore,; Gibson, E D; Ostenson, J E; Verhoeven, J D

In situ superconducting composites differ from bronze process Nb/sub 3/ SnCu multifilamentary conductors in two major features. The filaments for in situ conductors are discontinuous and have much smaller dimensions. In situ wire filaments also normally have a lacy ribbon shape 1 grain thick and about 8 to 12 grains wide. Despite these differences in the filament morphlogy and size, however, the flux pinning forces for in situ wires are very similar to bronze process material. The purpose of the work reported here was to use the magnetic field dependence of the critical current J /SUB c/ in conjunction with the detailed study of grain morphology via transmission electron micrographs in order to determine the major mechanisms that control J /SUB c/ and contribute to the flux pinning in these materials. Calculation methods and plots of a variety of results are presented. It is concluded that the magnitude and shape of the pinning force-versus-reduced field curves for in situ composites provide good evidence that what mainly controls J /SUB c/ is surface pinning and core interaction.

• Research Organization: Iowa State University Ames, IA
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 6205874
• Journal Information: Adv. Cryog. Eng.; (United States), Journal Name: Adv. Cryog. Eng.; (United States) Vol. 28; ISSN ACYEA
• Country of Publication: United States
• Language: English

Related Subjects

656101* -- Solid State Physics-- Superconductivity-- General Theory-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COMPOSITE MATERIALS
CRITICAL CURRENT
CRYOGENICS
CRYSTAL STRUCTURE
CURRENTS
ELECTRIC CURRENTS
GRAIN BOUNDARIES
MAGNETIC FLUX
MATERIALS
MATERIALS TESTING
MICROSTRUCTURE
SUPERCONDUCTING COMPOSITES
SUPERCONDUCTORS
TESTING
WIRES