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Anyonic excitations emerging from a Kitaev spin liquid can form a basis forquantum computers. Searching for such excitations motivated intense research onthe honeycomb iridate materials. However, access to a spin liquid ground statehas been hindered by magnetic ordering. Cu2IrO3 is a new honeycomb iridatewithout thermodynamic signatures of a long-range order. Here, we use muon spinrelaxation to uncover the magnetic ground state of Cu2IrO3. We find atwo-component depolarization with slow and fast relaxation rates correspondingto distinct regions with dynamic and static magnetism, respectively. X-rayabsorption spectroscopy and first principles calculations identify a mixedcopper valence as the origin of this behavior. Our results suggest that aminority of Cu2+ ions nucleate regions of static magnetism whereas the majorityof Cu+/Ir4+ on the honeycomb lattice give rise to a Kitaev spin liquid.

Competition between static and dynamic magnetism in the Kitaev spin liquid material Cu2IrO3