IEEE Transactions on Applied Superconductivity · 1997 · 18 citations · 4 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsMetallurgySolid State PhysicsElectrical ConductivityMagnetic Properties Of SolidsMetalsNanowiresPhase TransitionsSuperconducting MaterialsCritical Current DensityCurrent DensityFlux PinningIrreversibilitySuperconducting Critical TemperatureSuperconducting PropertiesSuperconducting WiresUpper Critical Field
Nb-Ti wires of different composition and metallurgical state have been studied near the upper critical field (H/sub c2/) in an attempt to separate H/sub c2/ the irreversibility field (H*) and the resistively measured transition field (H/sub r/). For optimized multifilamentary Nb-47wt.%Ti wire, we find that H*=10.2 T, H/sub c2/=10.8 T and H/sub r/=11.8 T at 4.2 K. The transitions were studied by extended electric field vs. current density curves, magnetization and small current transport measurements. We found a strong correlation between magnetization, bulk flux pinning (F/sub p/) extrapolation and extended E-J curves for the value of H*, all giving H*=10.2 T. We have also shown that the maximum in H/sub r/ occurs for Nb-44wt.% Ti.
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Experimental evidence for vortex-glass superconductivity in Y-Ba-Cu-O
R. H. Koch, V. Foglietti, W. J. Gallagher et al. · Physical Review Letters · 1989 · 977 citations · Full text