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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

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

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Autor(es):
Janssen, Lukas ; Andrade, Eric C. ; Vojta, Matthias
Número total de Autores: 3
Tipo de documento: Artigo Científico
Fonte: Physical Review B; v. 96, n. 6 AUG 25 2017.
Citações Web of Science: 42
Resumo

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)

Processo FAPESP: 13/00681-8 - Magnetos desordenados: estado fundamental, excitações e termodinâmica
Beneficiário:Eric de Castro e Andrade
Linha de fomento: Auxílio à Pesquisa - Apoio a Jovens Pesquisadores