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The critical current density and flux pinning properties of the Ba0.55K0.45Fe2As2 high-Tc superconductor with Tc = 37 K are studied using the field and the time dependences of the magnetization. The temperature dependence of the critical current density Jc(T) has been found to follow the form Jc ∝ (1−T/Tc)n and is consistent with δTc-type pinning due to randomly-distributed defects...
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