2017/06/30 by Lukas Janssen, Eric C. Andrade, Matthias Vojta · 6 citations
Materials Science · Mathematics · Physics and Astronomy · #Advanced Condensed Matter Physics #Geometry #Lattice (music) #Magnetization #Mathematics #Multiferroics and related materials #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Zigzag #cond-mat.stat-mech #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.96.064430
published as Phys. Rev. B 96, 064430 (2017) · 15 pages, 9 figures, 1 table; v2: additional comments and references, published version
openalex created_date 2017/06/30 · openalex publication_date 2017/08/25 · arxiv created 2017/09/01 · arxiv updated 2017/09/04 · openalex updated_date 2026/08/06
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 \ensuremathα\text\ensuremath-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 \mathrm\ensuremathΓ1 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 \mathrm\ensuremathΓ1>0 naturally explains the strongly anisotropic field responses observed in \ensuremathα\text\ensuremath-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 \ensuremathα\text\ensuremath-RuCl3.