scholarly journals Magnetically modulated critical current densities of Co/Nb hybrid

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Zhigang Li ◽  
Weike Wang ◽  
Li Zhang ◽  
Zhaorong Yang ◽  
Mingliang Tian ◽  
...  
Keyword(s):  
Critical Current ◽  
Current Densities

Facet Topography and Dislocation Structure as a Possible Source for Electrical Heterogeneity in [001] TILT Bicrystals of YBa2Cu3O7-δ

1996 ◽  
Vol 54 ◽  
pp. 338-339
Author(s):  
I-Fei Tsu ◽  
D.L. Kaiser ◽  
S.E. Babcock
Keyword(s):  
Grain Boundary ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Electromagnetic Properties ◽  
Length Scale ◽  
Density Values ◽  
Current Densities ◽  
Applied Fields ◽  
A Current

A current theme in the study of the critical current density behavior of YBa2Cu3O7-δ (YBCO) grain boundaries is that their electromagnetic properties are heterogeneous on various length scales ranging from 10s of microns to ˜ 1 Å. Recently, combined electromagnetic and TEM studies on four flux-grown bicrystals have demonstrated a direct correlation between the length scale of the boundaries’ saw-tooth facet configurations and the apparent length scale of the electrical heterogeneity. In that work, enhanced critical current densities are observed at applied fields where the facet period is commensurate with the spacing of the Abrikosov flux vortices which must be pinned if higher critical current density values are recorded. To understand the microstructural origin of the flux pinning, the grain boundary topography and grain boundary dislocation (GBD) network structure of [001] tilt YBCO bicrystals were studied by TEM and HRTEM.

scholarly journals Improved critical current densities in MgB2 tapes with ZrB2 doping

2006 ◽  
Vol 89 (13) ◽  
pp. 132510 ◽  
Author(s):  
Xianping Zhang ◽  
Zhaoshun Gao ◽  
Dongliang Wang ◽  
Zhengguang Yu ◽  
Yanwei Ma ◽  
...  
Keyword(s):  
Critical Current ◽  
Current Densities

Extraction of anisotropic critical current densities and flux pinning potentials

Cryogenics ◽  
1994 ◽  
Vol 34 (4) ◽  
pp. 329-334
Author(s):  
H.L Ji ◽  
Z.X Shi ◽  
Z.Y Zeng ◽  
X Jin ◽  
H.C Fan ◽  
...  
Keyword(s):  
Critical Current ◽  
Flux Pinning ◽  
Current Densities

Structure and Functional Properties of Bulk MgB2 Superconductors Synthesized and Sintered under Pressure

2014 ◽  
Vol 792 ◽  
pp. 21-26 ◽  
Author(s):  
Tatiana Prikhna ◽  
Michael Eisterer ◽  
Wolfgang Gawalek ◽  
Athanasios G. Mamalis ◽  
Artem Kozyrev ◽  
...  
Keyword(s):  
Critical Current ◽  
Material Structure ◽  
Bulk Materials ◽  
Critical Fields ◽  
Current Densities ◽  
Upper Critical Fields ◽  
Irreversibility Fields ◽  
Grain Boundary Pinning ◽  
Effect Of Oxygen ◽  
Oxygen Impurities

The high pressure (50 MPa - 2 GPa) – high temperature synthesized MgB2 bulk materials are characterized by nearly theoretical density (1-2% porosity), 80-98% connectivity, extremely high critical current densities (e.g. at 20 K, in 0–1 T jc=1.3–1.0 MA·cm-2 (with 10% SiC) and jc= 0.92 – 0.73 MA·cm-2 (without doping)), large irreversibility fields (Birr(18.4 K) =15 T and Birr (0 K) = 32.5 T) and high upper critical fields (Bc2 (22 K) =15 T and Bc2(0 K) ~ 42.1 T). The transformation of grain boundary pinning to point pinning in MgB2-based materials with increasing manufacturing temperature (from 800 to 1050 oC) under pressures from 0.1 to 2 GPa correlates well with an increase in critical current density in low external magnetic fields caused by the redistribution of boron and the oxygen impurities in the material structure. As the manufacturing temperature increases, the discontinuous oxygen enriched layers transform into distinct Mg-B-O inclusions and the size and amount of inclusions of higher magnesium borides MgBX (X>4) are reduced. The effect of oxygen and boron redistribution can be enhanced by Ti or SiC additions.

scholarly journals Geometry-dependent scaling of critical current densities for current-induced domain wall motion and transformations

2009 ◽  
Vol 80 (18) ◽  
Author(s):  
L. Heyne ◽  
J. Rhensius ◽  
Y.-J. Cho ◽  
D. Bedau ◽  
S. Krzyk ◽  
...  
Keyword(s):  
Domain Wall ◽  
Critical Current ◽  
Wall Motion ◽  
Domain Wall Motion ◽  
Current Densities

scholarly journals Controlling Cu–Sn mixing so as to enable higher critical current densities in RRP®Nb3Sn wires

2018 ◽  
Vol 31 (6) ◽  
pp. 064001 ◽  
Author(s):  
Charlie Sanabria ◽  
Michael Field ◽  
Peter J Lee ◽  
Hanping Miao ◽  
Jeff Parrell ◽  
...  
Keyword(s):  
Critical Current ◽  
Current Densities
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