A novel ferrimagnetic irido-cuprate: IrSr2GdCu2O8

We have performed an investigation of the structural, microstructural and magnetic properties of the new compound IrSr2GdCu2O8. The sample was prepared under high temperature (∼1393 K) and high-pressure conditions (∼60 Kbars) in a Belt type apparatus. X-ray diffraction (XRD) analysis shows that this irido-cuprate is isostructural with the corresponding Ru-1212 phase. Structurally, this material shows an interesting hierarchy of ordering phenomena, whose observation actually depends on the technique used to analyze the material: from a “simple” cell ap×ap×3ap which is supported by XRD, through a “diagonal” one, ∼2ap×2ap×3ap as seen by SAED, to a microdomain texture of this last one cell supported by HREM. A ferrimagnetic IrIV–GdIII spin ordering is observed below 15 K. The iridium oxidation state seems to be +4.

IrSr2GdCu2O8, prepared under high-temperature and high-pressure conditions, is a new member of the M-1212-type cuprates. A ferrimagnetic IrIV–GdIII spin ordering is observed below 15 K. The iridium oxidation state seems to be +4, while the copper oxidation state is Cu2.5+.Figure optionsDownload as PowerPoint slide