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Berlin 2005 – scientific programme

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MA: Magnetismus

MA 29: Magnetische Materialien

MA 29.13: Talk

Tuesday, March 8, 2005, 18:15–18:30, TU A060

Structural and magnetic properties of the solid solution series Sr2FeRe1−xSbxO6 — •Alexandra Jung, Vadim Ksenofontov, Sergey Reiman, Gerhard H. Fecher, Claudia Felser, and Wolfgang Tremel — Johannes Gutenberg - Universität, 55099 Mainz, Germany

Structural and magnetic studies of doped double perovskites Sr2Fe1−xMxReO6 (0 < x < 1, M = Zn, Cr) revealed a strong magnetic interaction between Fe and Re sublattices which leads to a ferrimagnetic phase. A transformation from ferrimagnetic to ferromagnetic order was observed at high Zn content. In this study, the effect of Sb dilution on the magnetic properties of Sr2FeRe1−xSbxO6 are exploited. X-ray powder diffraction points that all substituted samples adopt the same double perovskite structure like the original undoped compound with x=0. Magnetic measurements of Sr2FeRe1−xSbxO6 (≈ 0.5 < x < 1) indicate transformation to an antiferromagnetic phase, which was proved by 57Fe magnetic field Mößbauer spectroscopy. Application of 121Sb Mößbauer spectroscopy reveals the features of magnetic exchange within the Re sublattice.

(This work is funded by the DFG in FG 559.)

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