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 Sr₂FeRe_1−xSb_xO₆ — •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 Sr₂Fe_1−xM_xReO₆ (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 Sr₂FeRe_1−xSb_xO₆ 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 Sr₂FeRe_1−xSb_xO₆ (≈ 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.)