Structural, magnetic and electrical properties of single crystalline La(1-x)SrₓMnO₃ for 0.4 < x < 0.85

الأصل · EN

We report on structural, magnetic and electrical properties of Sr-doped LaMnO₃ single crystals for doping levels 0.4 < x < 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 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 (x²-y²)-type orbital order. For higher Sr concentrations an antiferromagnetic insulator is established below room temperature.