Structural, magnetic and electrical properties of single crystalline La(1-x)SrxMnO3 for 0.4 < x < 0.85
J. Hemberger, A. Krimmel, T. Kurz, H. -A. Krug von Nidda, V. Yu. Ivanov, A. A. Mukhin, A. M. Balbashov, A. Loidl
Abstract
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.
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