Abstract
The critical current density and flux pinning properties of the Ba0.55K0.45Fe2As2 high-T c superconductor with T c = 37 K are studied using the field and the time dependences of the magnetization. The temperature dependence of the critical current density J c (T) has been found to follow the form J c ∝ (1−T/T c ) n and is consistent with δT c -type pinning due to randomly-distributed defects that are larger than the coherence length ξ. The temperature dependence of the magnetic relaxation rate S exhibits a peak at a much lower temperature, which corresponds to a smaller pinning energy in the Ba0.55K0.45Fe2As2 superconductor. Moreover, the effective pinning potential U o increases with increasing temperature and this behavior is in agreement with those of high-T c cuprate superconductors.
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