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Flux pinning and thermally assisted flux flow are studied in a (Ba $$_{0.6}$$ 0.6 K $$_{0.4})$$ 0.4 ) Fe $$_{2}$$ 2 As $$_{2}(T_\mathrm{c}$$ 2 ( T c =38.3 K) bulk samples in magnetic fields up to 18 T via ac susceptibility measurements. Ac susceptibility curves shift to higher temperatures as the frequency is increased from 75 to 1,997 Hz in all...
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