We combine the results of magnetic and transport measurements with neutron-diffraction data to construct the structural and magnetic phase diagram of the entire family of ${\text{SrMn}}_{1-x}{\text{Ru}}_x{\text{O}}_3$ $\left(0\le x\le 1\right)$ perovskites. We have found antiferromagnetic (AF) ordering of the $C$ type for lightly Ru-substituted materials $\left(0.06\le x\le 0.5\right)$ in a similar manner to $R_y{\text{Sr}}_{1-y}{\text{MnO}}_3$ $\left(R=\text{La},\text{Pr}\right)$ due to the generation of ${\text{Mn}}^{3+}$ in both families of manganite perovskites by either $B$-site substitution of ${\text{Ru}}^{5+}$ for ${\text{Mn}}^{4+}$ or $A$-site substitution of $R^{3+}$ for ${\text{Sr}}^{2+}$. This similarity is driven by the same ratio of $d^4/d^3$ ions in both classes of materials for equivalent substitution level. In both cases, a tetragonal lattice distortion is observed, which for some compositions $\left(0.06\le x\le 0.2\right)$ is coupled to a $C$-type AF transition and results in a first-order magnetic and resistive transition. Heavily substituted ${\text{SrMn}}_{1-x}{\text{Ru}}_x{\text{O}}_3$ materials are ferromagnetic due to dominating exchange interactions between the ${\text{Ru}}^{4+}$ ions. Intermediate substitution $\left(0.6\le x\le 0.7\right)$ leads to a spin-glass behavior instead of a quantum critical point reported previously in single crystals due to enhanced disorder.

• Received 28 February 2008

DOI:https://doi.org/10.1103/PhysRevB.78.214425