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Synthesis, crystal structure, and magnetic properties of Ba3Os2O9: A new osmate with Cs3Tl2Cl9-type structure

MPG-Autoren
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Feng,  Hai L.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Geibel,  Christoph
Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Jansen,  Martin
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Zitation

Feng, H. L., Geibel, C., & Jansen, M. (2017). Synthesis, crystal structure, and magnetic properties of Ba3Os2O9: A new osmate with Cs3Tl2Cl9-type structure. Journal of Solid State Chemistry, 249, 15-20. doi:10.1016/j.jssc.2017.02.012.


Zitierlink: https://hdl.handle.net/11858/00-001M-0000-002D-3CB0-5
Zusammenfassung
The polycrystalline sample of a new osmate Ba3Os2O9 was synthesized by solid-state reactions. It crystallizes in Cs3Tl2Cl9-type structure, R (3) over bar cH (No. 167), and is electrically semiconducting with activated conduction behavior. No clear evidence for magnetic ordering is observed in the magnetic susceptibility. Instead it displays a very broad maximum around 170 K, indicating the onset of antiferromagnetic correlations, likely connected with the formation of magnetic dimers with an intra-dimer exchange, J congruent to 175 K. However, an analysis of the susceptibility reveals a reduced, but still finite susceptibility at low-temperature, in contrast to the fully gapped behavior expected for a simple dimer system. This suggests the presence of additional inter-dimer interactions, which might be frustrated and thus prevent a stable antiferromagnetic ordered state. The effective moment of 1.59 mu(B)/Os deduced from a dimer fit is much lower than the expected spin-only value of 2.83 mu(B), in accordance with expected strong spin-orbit interaction.