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The temperature dependencies of the excess conductivity $\sigma'(T)$ andpossible pseudogap (PG), in a Dy$_{0.6}$Y$_{0.4}$Rh$_{3.85}$Ru$_{0.15}$B$_4$polycrystal were studied for the first time. It was shown that $\sigma'(T)$near T$_{c}$ is well described by the Aslamazov Larkin fluctuation theory,demonstrating a crossover with increasing temperature. Using the crossovertemperature $T_0$, the coherence length along the c axis $\xi_c(0)$, wasdetermined. Above the level of $T_{2D}>T_{0}$, an unusual dependence$\sigma'(T)$ was found, which is not described by the fluctuation theories inthe range from $T_{0}$ to $T_{FM}$, at which a ferromagnetic transition occurs.The range in which superconducting fluctuations exist is apparently quitenarrow and amounts to $\Delta T_{fl}=2.8 K$. The resulting temperaturedependence of the PG parameter $\Delta^*(T)$ has the form typical of magneticsuperconductors with features at $T_{max}=154 K$ and the temperature of apossible structural transition at $T_{s}=95 K$. Below $T_{s}$, dependence$\Delta^*{T}$ has a shape typical for PG in cuprates, which suggests that thePG state can be realized in Dy$_{0.6}$Y$_{0.4}$Rh$_{3.85}$Ru$_{0.15}$B$_4$ inthis temperature range. Comparison of $\Delta^*(T)$ with the Peters Bauertheory made it possible to determine the density of local pairs ~0.35, nearT$_{c}$, which is 1.17 times greater than in optimally dopedYBa$_{2}$Cu$_{3}$O$_{7-\delta}$ single crystals.

Features of Excess Conductivity Behavior in a Magnetic Superconductor Dy$_{0.6}$Y$_{0.4}$Rh$_{3.85}$Ru$_{0.15}$B$_4$