Physical and magnetic properties of Ba(Fe1 xRux)2As2 single crystals

Single crystals of Ba(Fe1 xRux)2As2 ,x 0:2 and continues through the highest doping levels we report. The superconducting region is dome like, with maximum Tc ( 16:5 K) found around x 0:29. A phase diagram of temperature versus doping, based on electrical transport and magnetization measurements, has been constructed and compared to those of the Ba(Fe1 xTMx)2As2 (TM=Co, Ni, Rh, Pd) series as well as to the temperature-pressure phase diagram for pure BaFe2As2. Suppression of the structural/magnetic phase transition as well as the appearance of superconductivity is much more gradual in Ru doping, as compared to Co, Ni, Rh and Pd doping, and appears to have more in common with BaFe2As2 tuned with pressure; by plotting TS=Tm and Tc as a function of changes in unit cell dimensions, we nd that changes in the c=a ratio, rather than changes in c, a or V, unify the T (p) and T (x) phase diagrams for BaFe2As2 and Ba(Fe1 xRux)2As2 respectively.