Structural, magnetic, and electrical properties of single-crystalline La1-xSrxMnO3 (0.4<x<0.85) -: art. no. 094410

We report on structural, magnetic, and electrical properties of Sr-doped LaMnO3 single crystals for doping levels 0.4less than or equal toxless than or equal to0.85. 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 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.