Abstract
We have investigated the field dependence of flux creep in YBCO superconductors. The pinning energy exhibits two or three pinning regimes depending on the material. The magnetic relaxation rate exhibits a minimum at a threshold field H th of the order of H m2/2 (H m2 is the fishtail peak). These behaviors are consistent with existing collective creep models in a fields where the current density J grows with H. However, the H>H m2 behavior is ascribed to the onset of thermally activated dislocations in the vortex lattice and the breakdown of the elastic approximation usually assumed in the collective creep theories.
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