High-temperature magnetic anomaly in the Kitaev hyperhoneycomb compound −Li2IrO3
Alejandro Ruiz, Vikram Nagarajan, Mayia Vranas, Gilbert Lopez, Gregory T. McCandless, Itamar Kimchi, Julia Y. Chan, Nicholas P. Breznay*, Alex Frano, Benjamin A. Frandsen, and James G. Analytis
High-temperature magnetic anomaly in the Kitaev hyperhoneycomb compound −Li2IrO3
Physical Review B 101, 075112 (2020)
Abstract
We report the existence of a high-temperature magnetic anomaly in the three-dimensional Kitaev candidate material, −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.