Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 53: Frustrated Magnets - Strong Spin-Orbit Coupling (joint session TT/MA)

TT 53.4: Vortrag

Donnerstag, 4. April 2019, 10:15–10:30, Theater

Copper and zinc iridates - new derivatives of the β-Li₂IrO₃ structure — •Alexander O. Zubtsovskii and Alexander A. Tsirlin — EP VI, EKM, University of Augsburg, Germany

Lithium and sodium iridates (A₂IrO₃ where A = Li, Na) form a narrow group of real-world material prototypes of the Kitaev model on the honeycomb and 3D honeycomb-like lattices. Tuning their properties by suitable chemical substituions remains a challenging problem, because only a few A₂IrO₃ iridates can be obtained by high-temperature solid synthesis. Here, we report two new compounds based on the β-Li₂IrO₃ structure and obtained by low-temperature ionic exchange of the Li⁺-ions for the nonmagnetic (Zn²⁺) and magnetic (Cu²⁺) ions. Crystal structures refined using synchrotron X-ray diffraction data suggest the same motif of IrO₆ octaedra as in the parent compound, but with different positions of Cu²⁺ and Zn²⁺ compared to Li⁺. We further report magnetic susceptibility data and discuss the nature of magnetism in these new compounds.