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TT: Fachverband Tiefe Temperaturen

TT 19: Frustrated Magnets - Spin Liquids - Theory

TT 19.7: Talk

Monday, March 12, 2018, 16:30–16:45, H 3010

Lattice disorder and spin-orbital behaviour in Ba₃CuSb₂O₉ — •Andrew Smerald^1,2 and Frederic Mila¹ — ¹Institute of Physics, Ecole Polytechnique Federale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland — ²Max Planck Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany

The material Ba₃CuSb₂O₉ has elicited attention recently due to the proposal that it realises a spin-orbital liquid state. One difficulty in understanding this behaviour comes from the fact that the lattice structure of the Cu²⁺ ions is disordered. In order to better understand the lattice we study a model of charged Sb⁵⁺-Cu²⁺ dumbbells living on a triangular lattice. We find a complicated ’branch’ lattice with correlated disorder of the dumbbells. Starting from this lattice structure we speculate on the possible spin-orbital state, proposing a state with delocalised orphan spins.