Abstract
We report on measurements of the time dependent irreversible magnetization due to flux creep in the high-Tc superconductor HgBa2CuO4 (Hg-1201). Close attention is paid to the low-field, low-temperature region of the mixed state where flux creep is dominated by the motion of individually pinned flux lines. We have analyzed the relaxational behavior in Hg-1201 in order to specify the nonlinear relationship between activation energy and current density. For the studied temperature region in total, the experimental findings fit in best with predictions given by the collective pinning theory, i.e. the current dependent activation barrier follows a power-law behavior. Towards higher temperatures, however, an uniform description becomes basically questioned by the strong changes in vortex dynamics found earlier in Hg-1201.
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