scholarly journals Transport critical currents and grain boundary coupling in high-{Tc} superconductors

1991 ◽  
Author(s):  
Donglu Shi
Keyword(s):  
Grain Boundary ◽  
Critical Currents ◽  
High Tc Superconductors ◽  
High Tc

Doping induced enhancement of the critical currents of grain boundaries in high-Tc superconductors

2000 ◽  
Vol 341-348 ◽  
pp. 1393-1396 ◽  
Author(s):  
J. Mannhart ◽  
H. Bielefeldt ◽  
B. Goetz ◽  
H. Hilgenkamp ◽  
A. Schmehl ◽  
...  
Keyword(s):  
Grain Boundaries ◽  
Critical Currents ◽  
High Tc Superconductors ◽  
High Tc

Critical currents and magnetic properties of Bi- and Tl-based new high Tc superconductors

Cryogenics ◽  
1989 ◽  
Vol 29 (3) ◽  
pp. 286-290 ◽  
Author(s):  
K. Togano ◽  
H. Kumakura ◽  
D.R. Dietderich
Keyword(s):  
Magnetic Properties ◽  
Critical Currents ◽  
High Tc Superconductors ◽  
High Tc

Critical currents in high Tc superconductors

Cryogenics ◽  
1990 ◽  
Vol 30 (5) ◽  
pp. 388-389 ◽  
Author(s):  
P. Komarek
Keyword(s):  
Critical Currents ◽  
High Tc Superconductors ◽  
High Tc

Electron localization induced by grain boundary disorder in the normal state of high-Tc superconductors

2003 ◽  
Vol 125 (2) ◽  
pp. 71-76 ◽  
Author(s):  
A M'chirgui ◽  
M Zouaoui ◽  
F Ben Azzouz ◽  
B Yangui ◽  
M Ben Salem
Keyword(s):  
Grain Boundary ◽  
Normal State ◽  
Electron Localization ◽  
High Tc Superconductors ◽  
High Tc

Current transport across grain boundary networks in high-Tc superconductors

1990 ◽  
Vol 168 (1) ◽  
pp. 345-352 ◽  
Author(s):  
J. Mannhart ◽  
R.P. Huebener ◽  
F. Kober ◽  
D. Koelle ◽  
P. Chaudhari ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Current Transport ◽  
High Tc Superconductors ◽  
High Tc

The effect of twins on critical currents of high Tc superconductors

1989 ◽  
Vol 162-164 ◽  
pp. 1605-1606 ◽  
Author(s):  
F.J. Blunt ◽  
A.M. Campbell ◽  
P.P. Edwards ◽  
J.E. Evetts ◽  
P. Freeman ◽  
...  
Keyword(s):  
Critical Currents ◽  
High Tc Superconductors ◽  
High Tc

Grain Boundary Structure and Properties of High-Tc Superconductors

1992 ◽  
Vol 275 ◽  
Author(s):  
K. Jagannadham ◽  
J. Narayan
Keyword(s):  
Grain Boundary ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Boundary Effects ◽  
Boundary Structure ◽  
Excess Charge ◽  
High Tc Superconductors ◽  
High Tc ◽  
Grain Boundary Structure

ABSTRACTWe have modelled the grain boundaries in high-Tc superconducting oxides and determined the critical current density. The tunneling of superconducting pairs across the coalesced regions is used to determine the boundary effects. The length of the coalesced regions, with continuity of the Cu-O planes maintained by relaxation of the atom positions, is determined by minimization of the energy of the configuration. The depression of the order parameter is evaluated using the continuity conditions at the boundary in the proximity effect formulation. The excess charge distribution at the core of the boundary, determined from the solution to the Poisson's equation, is used to determine the scattering of the superconducting pairs. The width of the boundary, evaluated from modelling, determines the transmission coefficient for tunnelingof superconducting pairs. The critical current density is expressed in terms of these four important factors associated with the grain boundary. All the experimental results are explained by the present modelling of the grain boundary effects.

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