Minimal models of α−Li2IrO3 : Range of interactions, ground state properties, and magnetization processes
| Autor: | Maria Laura Baez |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Physics
Condensed matter physics 02 engineering and technology Electronic structure Minimal models 021001 nanoscience & nanotechnology 01 natural sciences k-nearest neighbors algorithm Minimal model Magnetization 0103 physical sciences 010306 general physics 0210 nano-technology Anisotropy Ground state Spin-½ |
| Zdroj: | Physical Review B. 99 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.99.184436 |
| Popis: | In recent years, a lot of effort has been devoted to the quest for experimental realizations of Kitaev interactions in spin systems. Recently, many materials have been synthesized which seem to realize extended Kitaev models, where Kitaev interactions are supplemented by Heisenberg and other bond dependent terms. The crystal and electronic structure of these materials renders the determination of a minimal model a nontrivial pursuit. In this work, we will concentrate on one of these particular materials, $\ensuremath{\alpha}\text{\ensuremath{-}}{\mathrm{Li}}_{2}{\mathrm{IrO}}_{3}$, for which various minimal models have been proposed. Employing large scale Monte Carlo simulations we show how the number of prospective models can be reduced. We study in detail six models with a different range of interactions and show how only two of those reproduce the most recent experimental results for this material. We obtain two possible minimal models, one of them with nearest neighbor interactions, while the other includes interactions up to third neighbors. Furthermore, we show that strong bond anisotropies and further neighbor interactions are crucial to stabilize the tilted counterrotating spirals found in $\ensuremath{\alpha}\text{\ensuremath{-}}{\mathrm{Li}}_{2}{\mathrm{IrO}}_{3}$. We further clarify the picture and distinguish these two models by studying the magnetization processes. We predict the magnetization behavior of these models and propose future experimental directions. |
| Databáze: | OpenAIRE |
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