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Regensburg 2004 – scientific programme

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TT: Tiefe Temperaturen

TT 8: Postersitzung I: Supraleitung

TT 8.11: Poster

Monday, March 8, 2004, 14:30–19:00, Poster A

Finite size effects and JC simulations in high-JC coated conductors — •J. Hänisch, L. Fernández, C. Cai, V.S. Sarma, L. Schultz und B. Holzapfel — IFW Dresden, Helmholtzstr. 20, 01069 Dresden, Germany

The superconducting layer in coated conductors consists a network of small angle grain boundaries. Due to the limitation of JC on grain boundaries in high-TC superconductors, the current flow through this network is of percolative nature and depends on misorientation angle distribution, width and length of the tape and grain shape. The current flow through grain boundary networks had been simulated widely with purely statistical models on artificial networks. Recent investigations of biaxially textured orthorhombic materials (as YBCO on coated conductors is) showed a nonrandom distribution of misorientation angles in this materials.
JC simulations using a fast and simple limiting-path algorithm were used to investigate the influence of the grain boundary misorientation statistics on JC in realistic networks. Input of the simulation program are large EBSD (electron back scattering diffraction) maps and the misorientation angle dependence of JC. We found a strong dependence of JC on the bridge width for bridges smaller then 20 grains (in comparisson to purely statistical models), whereas JC is not strongly varying for wider bridges. In rotating the whole EBSD map, we could simulate the influence of the grain aspect ratio on JC. In current direction elongated grains show significantly higher JC values. Both these results are promissing for the performance of coated conductors.

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