Abstract
ABSTRACTVarious questions concerning pinning and flux creep in high- temperature superconductors are addressed. First the pinning force by point defects in CuO2-layers in Bi:2212 and Y:123 single crystals is computed. Then some possibilities for the pin mechanism of the recently discovered screw dislocations in sputtered Y:123 films are discussed. Finally, we turn to the issue of flux creep in these materials and the relation between activation barrier and current density. The relevance of different creep models is further elucidated by the numerical solution of the non-linear creep equation for infinite slab and cylinder geometries and various initial field and current distributions.
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