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Abstract
The analysis of the activation energy in the magnetization relaxation of Bi 2Sr 2CaCu 2O 8+ δ (BSCCO) single crystals reveals plastic vortex creep above the second magnetization peak (SMP). Above the peak field, the magnetic field dependence of the activation energy U( B) is very close to the form U( B)∝ B −1/2 and the intrinsic variation of U with the current density is weak. The existence of a crossover from elastic to plastic vortex creep across the SMP of high-temperature superconductors (HTSC) seems to be a general behavior, and may have important consequences on the nature of the thermally induced vortex solid–vortex fluid transition at high magnetic fields.
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