Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 47: Frustrated Magnets - Iridates and Fe-based Materials
TT 47.5: Vortrag
Mittwoch, 14. März 2018, 10:30–10:45, H 0104
Robust spin liquid state in honeycomb iridate D3LiIr2O6 against large isotope effect — •Tomohiro Takayama1,2, Kentaro Kitagawa3, Yosuke Matsumoto1, Kenji Ishii4, Sebastian Bette1, Robert Dinnebier1, and Hidenori Takagi1,2,3 — 1Max Planck Insitute for Solid State Research, Stuttgart, Germany — 2University of Stuttgart, Stuttgart, Germany — 3University of Tokyo, Tokyo, Japan — 4QST SPring-8, Hyogo, Japan
Honeycomb iridates recently appeared as a possible materialization of Kitaev spin liquid. All hitherto-known candidate materials display a magnetic order at low temperatures likely due to the presence of additional magnetic interactions. We recently succeeded in realizing a quantum spin liquid state in proton-exchanged honeycomb iridate H3LiIr2O6. H3LiIr2O6 shows a large negative Weiss temperature θCW ∼ -105 K, and it is not clear yet whether the Kitaev coupling is indeed a prime driving force for the spin liquid state or not.
We also synthesized an isotropic compound D3LiIr2O6. Although D3LiIr2O6 crystallizes basically in the same crystal structure with H3LiIr2O6, it shows a large structural isotope effect with the elongated c-axis. This results in a substantial change in magnetic couplings; the antiferromagnetic couplings are enhanced as evidenced by θCW ∼ -168 K. Nevertheless, D3LiIr2O6 retains a spin-liquid state. We will discuss the differences from H3LiIr2O6 and details of their spin-liquid state.