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The study of excess conductivity $\sigma'(T)$ in the textured polycrystallineFeAs-based superconductor $EuFeAsO_{0.85}F_{0.15}$ ($T_c = 11\, K$) prepared bythe solid state synthesis is reported. The $\sigma'(T)$ analysis has beenperformed within the Local Pair (LP) model based on the assumption of the LPformation in cuprate high-$T_c$ superconductors (cuprates) below the pseudogap(PG) temperature $T^*\gg T_c$. Similarly to the cuprates, near $T_c$$\sigma'(T)$ is adequately described by the 3D term of the Aslamasov-Larkin(AL) theory but the range of the 3D-AL fluctuations, $\Delta T_{3D}$, isrelatively short. Above the crossover temperature $T_0 \approx 11.7\,K$$\sigma'(T)$ is described by the 2D Maki-Thompson (MT) fluctuation term of theHikami-Larkin (HL) theory. But enhanced 2D-MT fluctuation contribution, beingtypical for the magnetic superconductors, is observed. Within the LP modelapproach the PG parameter, $\Delta^*(T)$, was determined for the first time.$\Delta^*(T)$ shows the narrow maximum at $T_s \approx 160\,K$ followed by thelinear drop down to $T_{SDW}=T_{NFe}\approx 133\,K$. Both small $\Delta T_{3D}$and enhanced $\sigma'(T)$, including linear $\Delta^*(T)$ drop, are consideredto be the evidence of the enhanced magnetic interaction in$EuFeAsO_{0.85}F_{0.15}$. Importantly, the slop of the linear $\Delta^*(T)$ andits length are found to be the same as observed for $SmFeAsO_{0.85}$. Theresults suggest both the similarity of magnetic interaction processes indifferent Fe-pnictides and applicability of the LP model approach to the$\sigma'(T)$ analysis even in magnetic superconductors.

Fluctuation conductivity and possible pseudogap state in FeAs-based superconductor EuFeAsO(0.85)F(0.15)