Dresden 2020 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 35: Frustrated Magnets - Strong Spin-Orbit Coupling 1 (joint session TT/MA)

TT 35.12: Talk

Wednesday, March 18, 2020, 12:45–13:00, HSZ 304

MgIrO₃ and ZnIrO₃: new hyperhoneycomb iridates — •Alexander O. Zubtsovskii and Alexander A. Tsirlin — EP VI, EKM, University of Augsburg, Germany

Iridates with edge-sharing IrO₆ octahedra host Kitaev interactions and show unusual magnetic behavior triggered by the exchange anisotropy and frustration. Here, we report two new compounds, MgIrO₃ and ZnIrO₃, obtained by the ionic substitution into the hyperhoneycomb beta-Li₂IrO₃. Crystal structures studied by synchrotron x-ray diffraction and high-resolution electron microscopy show lower symmetry than the parent compound, because Mg²⁺ and Zn²⁺ as divalent cations occupy different positions than Li⁺. Magnetic behavior is characterized using magnetization and heat capacity measurements as well as muon spin relaxation.