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Thermally assisted flux flow (TAFF) based on magneto-resistivity and ac susceptibility measurements is studied in a Ba(Fe0.91Co0.09)2As2(Tc=25.3 K) sample in magnetic fields up to 18 T. In addition to the upper critical field μ0Hc2 and the coherence length ξ(0), the flux flow activation energy U(T,H) has also been determined. The resistive transition width is proportional to μ0H, in contrast...
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