Crystal and magnetic structures of iridium-containing double perovskites Sr2IrMO6 (M= Ca, Ni, Cu, Zn)
We propose the study of novel oxides of stoichiometry Sr2MIrO6 (M= Ca, Zn, Ni and Cu). The ability of Ir to exist in different oxidation states and the spatially more extended 5d orbitals result in a rich variety of interactions with the first-row transition metal partner in the mentioned double perovskites. Here we have been able to stabilize Ir(VI) at 200 bar O2 pressure. The Ca material was previously described in the pioneering work by Demazeau, who studied the crystal structure by XRD (TN= 80 K). For Sr2NiIrO6, the ZFC susceptibility shows a maximum at TN=58 K, plausibly corresponding to the long-range magnetic ordering of Ni and Ir magnetic sublattices. The actual oxidation states of Ni and Ir (Ni2++Ir6+ vs Ni3+ + Ir5+) are also an unknown, since this compound is reported here for the first time. In this experiment we expect to make a comprehensive and detailed structural description, unveiling the influence of the covalency of Ir-O bonds on the tilting and deformation of the IrO6 octahedra, as well as to understand the microscopic origin of the observed magnetism from the study of the magnetic structures.
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ALONSO Jose Antonio; FERNANDEZ DIAZ Maria Teresa; Paula Kayser; MARTINEZ LOPE M-Jesus; RETUERTO MILLAN Maria; TORRES Betzabe and TRONCOSO Loreto. (2012). Crystal and magnetic structures of iridium-containing double perovskites Sr2IrMO6 (M= Ca, Ni, Cu, Zn). Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2229
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