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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Magnetization processes of zigzag states on the honeycomb lattice: Identifying spin models for alpha-RuCl3 and Na2IrO3

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Janssen, Lukas ; Andrade, Eric C. ; Vojta, Matthias
Total Authors: 3
Document type: Journal article
Source: Physical Review B; v. 96, n. 6 AUG 25 2017.
Web of Science Citations: 42

We study the field-induced magnetization processes of extended Heisenberg-Kitaev models on the honeycomb lattice, taking into account off-diagonal and longer-range exchange interactions, using a combination of Monte Carlo simulations, classical energy minimization, and spin-wave theory. We consider a number of different parameter sets, previously proposed to describe the magnetic behavior of alpha-RuCl3 and Na2IrO3 with their antiferromagnetic zigzag ground states. By classifying these parameter sets, we reveal the existence of three distinct mechanisms to stabilize zigzag states, which differ in the sign of the nearest-neighbor Kitaev interaction, the role of longer-range interactions, and the magnitude of the off-diagonal Gamma(1) interaction. While experimentally hardly distinguishable at zero field, we find that the three different scenarios lead to significantly different magnetization processes in applied magnetic fields. In particular, we show that a sizable off-diagonal interaction Gamma(1) > 0 naturally explains the strongly anisotropic field responses observed in alpha-RuCl3 without the need for a strong anisotropy in the effective g tensor. Moreover, for a generic field direction, it leads to a high-field state with a finite transversal magnetization, which should be observable in alpha-RuCl3 . (AU)

FAPESP's process: 13/00681-8 - Disordered magnets: ground state, excitations, and thermodynamics
Grantee:Eric de Castro e Andrade
Support type: Research Grants - Young Investigators Grants