Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

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

TT 35.12: Vortrag

Mittwoch, 18. März 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.

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