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Single crystals of Ba(Fe$_{1-x}$Ru$_x$)$_2$As$_2$, $x<0.37$, have been grownand characterized by structural, magnetic and transport measurements. Thesemeasurements show that the structural/magnetic phase transition found in pureBaFe$_2$As$_2$ at 134 K is suppressed monotonically by Ru doping, but, unlikedoping with TM=Co, Ni, Cu, Rh or Pd, the coupled transition seen in the parentcompound does not detectably split into two separate ones. Superconductivity isstabilized at low temperatures for $x>0.2$ and continues through the highestdoping levels we report. The superconducting region is dome like, with maximumT$_c$ ($\sim16.5$ K) found around $x\sim 0.29$. A phase diagram of temperatureversus doping, based on electrical transport and magnetization measurements,has been constructed and compared to those of theBa(Fe$_{1-x}$TM$_x$)$_2$As$_2$ (TM=Co, Ni, Rh, Pd) series as well as to thetemperature-pressure phase diagram for pure BaFe$_2$As$_2$. Suppression of thestructural/magnetic phase transition as well as the appearance ofsuperconductivity is much more gradual in Ru doping, as compared to Co, Ni, Rhand Pd doping, and appears to have more in common with BaFe$_2$As$_2$ tunedwith pressure; by plotting $T_S/T_m$ and $T_c$ as a function of changes in unitcell dimensions, we find that changed in the $c/a$ ratio, rather than changesin $c$, $a$ or V, unify the $T(p)$ and $T(x)$ phase diagrams for BaFe$_2$As$_2$and Ba(Fe$_{1-x}$Ru$_x$)$_2$As$_2$ respectively.

Physical and magnetic properties of Ba(Fe$_{1-x}$Ru$_x$)$_2$As$_2$ single crystals