LAUSR

Author(s): Ruiz, A; Nagarajan, V; Vranas, M; Lopez, G; McCandless, GT; Kimchi, I; Chan, JY; Breznay, NP; Frano, A; Frandsen, BA; Analytis, JG | Abstract: © 2020 American Physical Society. We report the existence of a high-temperature magnetic anomaly in the three-dimensional Kitaev candidate material, β-Li2IrO3. Signatures of the anomaly appear in magnetization, heat capacity, and muon spin relaxation measurements. The onset coincides with a reordering of the principal axes of magnetization, which is thought to be connected to the onset of Kitaev-like correlations in the system. The anomaly also shows magnetic hysteresis with a spatially anisotropic magnitude that follows the spin-anisotropic exchange anisotropy of the underlying Kitaev Hamiltonian. We discuss possible scenarios for a bulk and impurity origin.