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The goal is a real crystal whose ground state without any applied field is the Kitaev spin liquid.","posed_since":"2009","precise":"Identify a compound with bond-dependent Kitaev exchange $K$ dominant enough over Heisenberg $J$ and off-diagonal $\\Gamma$ terms to lie inside the Kitaev phase of the $J-K-\\Gamma$ model, showing no magnetic order or spin freezing down to $k_{\\mathrm{B}} T << \\mid K \\mid$ and fractionalized excitations confirmed spectroscopically. Candidates include H3LiIr2O6 (no order but strong disorder) and cobalt-based honeycomb compounds (Na2Co2TeO6, BaCo2(AsO4)2), whose Kitaev fraction is disputed. An answer is the material with its measured exchange parameters.","problem_ref":null,"references":"","settled_by":"A clean single crystal with exchange parameters inside the Kitaev phase, no order to the lowest temperature, and neutron and thermal-transport data consistent with Majorana and flux excitations.","status_note":"","title":"Find a material with a Kitaev spin-liquid ground state in zero 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