Critical current densities and vortex dynamics in FeTexSe1−x single crystals

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.