Universal magnetic behavior the electron-doped SrMnO$_{3}$ cubic perovskite

SrMnO$_{3}$ is the end member of a widely explored family of colossal magnetoresistive manganites R$_{x}$Sr$_{1-x}$MnO$_{3}$ (R=rare earth elements). Low-level R$^{3+}$ substitutions change the antiferromagnetic order from G-type in cubic SrMnO$_{3}$ to C-type in tetragonal R$_{x}$Sr$_{1-x}$MnO$_{3}$ through first-order resistive and structural transitions. From the magnetization, transport, and neutron diffraction experiments we observe that a similar change can be induced by B-site substitutions in SrMn$_{1-x}$M$_{x}$O$_{3}$ (M=Ru$^{5+}$,Mo$^{6+})$ both generating Mn$^{3+}$ in the Mn$^{4+}$ matrix. For both A-site and B-site substitutions, the N\'{e}el temperature is dependent on the Mn$^{3+}$ concentration in a universal way. These observations reveal that the magnetic and electronic properties of low-level substituted SrMnO$_{3}$ are controlled by the band filling throughout the increasing role of local distortions of Mn$^{3+}$O$_{6}$ octahedra changing from randomly diluted to cooperative character of the entire lattice. Work at NIU was supported by the NSF (DMR-0706610) and at ANL by the U.S. DOE under contract No. DE-AC02-06CH11357.