Critical currents for superconducting composites in the 1000-A regime

Journal Article · Sun Apr 01 04:00:00 EST 1979 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.326203· OSTI ID:6119592

Finnemore, D; Verhoeven, J D; Ostenson, J E; Gibson, E D; Sample, H H

Multifilamentary superconducting composites having Nb/sub 3/Sn filament sizes in the 200--2000-A regime have been studied in magnetic fields up to 18 T. The critical currents obey Kramer's scaling laws, and flux pinning at high fields is governed by the flux-line lattice shear modulus C/sub 66/. Despite the discontinuous nature of the filaments, the flux pinning at the field approaching H/sub c/2 is very similar to the large-diameter continuous filament case. The upper critical field is somewhat lower than bulk Nb/sub 3/Sn as expected from the stress imposed by the bronze matrix. With the addition of a few percent Ga, H/sub c/2 can be raised by about 2 T.

• Research Organization: Ames Laboratory: USDOE and Department of Physics, Iowa State University, Ames, Iowa 50011
• OSTI ID: 6119592
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 50:4; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360304* -- Composite Materials-- Physical Properties-- (-1987)
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOYS
BRONZE
COMPOSITE MATERIALS
COPPER ALLOYS
COPPER BASE ALLOYS
CRITICAL CURRENT
CURRENTS
ELECTRIC CURRENTS
FILAMENTS
INTERMETALLIC COMPOUNDS
KRAMERS THEOREM
MAGNETIC FLUX
NIOBIUM ALLOYS
SHEAR
SUPERCONDUCTING COMPOSITES
TIN ALLOYS