High-temperature magnetic anomaly in the Kitaev hyperhoneycomb compound β−Li2IrO3

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 magnet...

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Bibliographic Details
Published in:Physical review. B 2020-02, Vol.101 (7)
Main Authors: Ruiz, Alejandro, Nagarajan, Vikram, Vranas, Mayia, Lopez, Gilbert, McCandless, Gregory T, Kimchi, Itamar, Chan, Julia Y, Breznay, Nicholas P, Frañó, Alex, Frandsen, Benjamin A, Analytis, James G
Format: Article
Language:English
Subjects:
Anisotropy
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Heat exchange
High temperature
Hysteresis
Magnetic anomalies
Magnetization
Materials selection
Muon spin relaxation
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Summary: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.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.101.075112