Crystal and magnetic structures of new double perovskites containing iridium and ruthenium
We propose the study of novel oxides of stoichiometry R2NiRuO6 (R= La, Nd, Pr, Ho, Y, Er, Tm, Yb) and R2NiIrO6 (R= Nd, Pr, Ho, Y). The ability of Ru and Ir to exist in different oxidation states and the spatially more extended 4d and 5d orbitals result in a rich variety of interactions with Ni in the mentioned double perovskites. The actual oxidation states of Ni and Ru/Ir (e.g. Ni2+ + Ir6+ vs Ni3+ + Ir5+) are also an unknown, since these compounds are reported here for the first time. For all the compounds the ZFC susceptibilities show anomalies plausibly corresponding to the long-range magnetic ordering of Ni and Ru/Ir magnetic sublattices. For instance, for Ho2NiRuO6 TN= 110 K. In this experiment we expect to make a comprehensive and detailed structural description, unveiling the influence of the covalency of Ru-O and Ir-O bonds on the tilting and deformation of the RuO6 and 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 Ruben and MARTINEZ LOPE M-Jesus. (2013). Crystal and magnetic structures of new double perovskites containing iridium and ruthenium. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2268
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