Berlin 2015 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 23: Magnetic Heuslers, Half-Metals, Semiconductors, and Oxides (organized by MA)

TT 23.2: Talk

Monday, March 16, 2015, 15:15–15:30, H 1012

Anisotropy of magnetic interactions in β-Li₂IrO₃ — •Alexander Yaresko and Yoshiro Nohara — MPI FKF, Stuttgart, Germany

Iridium oxides α-Li₂IrO₃ and α-Na₂IrO₃ with a honeycomb lattice attracted much attention as possible candidates for realization of a Kitaev model with bond-dependent anisotropic magnetic interactions. Recently, another complex Ir oxide β-Li₂IrO₃ has been synthesized which is expected to be close to forming a Kitaev spin liquid. Ir ions in this oxide form a “hyper-honeycomb” lattice, a three-dimensional analogue of the honeycomb lattice of α-Na₂IrO₃. We performed LDA+U band structure calculations for β-Li₂IrO₃ with different magnetic orderings of Ir magnetic moments. The results are mapped onto a model which includes isotropic Heisenberg-like as well as bond-dependent anisotropic interactions. It is shown that the contribution of the anisotropic interactions to the magnetic energy is at least as strong as isotropic one.