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Regensburg 2019 – scientific programme

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TT: Fachverband Tiefe Temperaturen

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

TT 53.4: Talk

Thursday, April 4, 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.

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