Abstract
The critical current density and the normalized relaxation rate are reported in FeTe0.59Se0.41 single crystal. Critical current density is of order of 105A/cm2, which is comparable to that in Co-doped BaFe2As2. In low temperature and low field region, the vortex dynamics of this system is well defined by the collective creep theory, which is quite similar to Co-doped BaFe2As2 reported before. We also discuss the origin of the anomaly in the field dependence of the relaxation rate.
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