Structural, magnetic, and electrical properties of single-crystalline ${\mathrm{La}}_{1-x}{\mathrm{Sr}}_x{\mathrm{MnO}}_3$ $\mathrm{}(0.4<x<\mathrm{}0.85\mathrm{})\mathrm{}$

We report on structural, magnetic, and electrical properties of Sr-doped ${\mathrm{LaMnO}}_3$ single crystals for doping levels $0.4<~x<~\mathrm{0.85.}$ The complex structural and magnetic phase diagram can only be explained assuming significant contributions from the orbital degrees of freedom. Close to $x=0.6\mathrm{}$ a ferromagnetic metal is followed by an antiferromagnetic metallic phase below 200 K. This antiferromagnetic metallic phase exists in a monoclinic crystallographic structure. Following theoretical predictions this metallic antiferromagnet is expected to reveal an ${(x}^2-y^2)$-type orbital order. For higher Sr concentrations an antiferromagnetic insulator is established below room temperature.