Coexistence of static and dynamic magnetism in the Kitaev spin liquid material Cu2IrO3

Abstract : Searching for a Kitaev spin liquid phase motivated intense research on the honeycomb iridate materials. However, access to a spin liquid ground state has been hindered by magnetic ordering. Cu2IrO3 is a new honeycomb iridate without thermodynamic signatures of a long-range order. Here, we use muon spin relaxation to uncover the magnetic ground state of Cu2IrO3. We find a two-component depolarization with slow- and fast-relaxation rates corresponding to distinct regions with dynamic and static magnetism coexisting in the material. X-ray absorption spectroscopy and first-principles calculations identify a mixed copper valence as the origin of this behavior. Our results suggest that a minority of Cu2+ ions nucleate regions of static magnetism, whereas the majority of Cu+/Ir4+ on the honeycomb lattice give rise to a Kitaev spin liquid.
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Submitted on : Wednesday, October 2, 2019 - 11:52:15 AM
Last modification on : Thursday, October 3, 2019 - 1:25:58 AM

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Eric M. Kenney, Carlo U. Segre, William Lafargue-Dit-Hauret, Oleg Lebedev, Mykola Abramchuk, et al.. Coexistence of static and dynamic magnetism in the Kitaev spin liquid material Cu2IrO3. Physical Review B, 2019, 100 (9), ⟨10.1103/PhysRevB.100.094418⟩. ⟨hal-02303399⟩

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