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arXiv 2203.00282cond-mat.str-elcond-mat.supr-con
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蜂窝状磁体Na2Co2TeO6有序态和顺磁态的激发

Excitations in the ordered and paramagnetic states of honeycomb magnet Na2Co2TeO6

Weiliang Yao, Kazuki Iida, Kazuya Kamazawa, Yuan Li

摘要:

Na2Co2TeO6是一种近似的Kitaev磁体,但由于缺乏对完整激发光谱的了解,其实际的磁相互作用是难以捉摸的。在这里,使用非弹性中子散射和单晶,我们确定系统的温度依赖的磁激发在整个布里渊区。在不承诺特定模型的情况下,我们揭示了自旋波中第三近邻耦合的独特特征,这表明相关距离是有序状态中新兴的“软链接”。至少有六个不重叠的自旋波分支的存在与迄今为止提出的所有模型都不一致。在有序化温度以上,持续的动力学关联可以用六方团簇的等时磁结构因子来描述,它揭示了主导的不稳定性。我们的结果集明确的约束Na2Co2TeO6的理论模型,并提供了新的见解Kitaev模型的实现。

英文摘要:

Na2Co2TeO6 is a proposed approximate Kitaev magnet, yet its actual magnetic interactions are elusive due to a lack of knowledge on the full excitation spectrum. Here, using inelastic neutron scattering and single crystals, we determine the system's temperature-dependent magnetic excitations over the entire Brillouin zone. Without committing to specific models, we unveil a distinct signature of the third-nearest-neighbor coupling in the spin waves, which signifies the associated distance as an emerging "soft link" in the ordered state. The presence of at least six non-overlapping spin-wave branches is at odds with all models proposed to date. Above the ordering temperature, persisting dynamic correlations can be described by equal-time magnetic structure factors of a hexagonal cluster, which reveal the leading instabilities. Our result sets definitive constraint on theoretical models for Na2Co2TeO6 and provides new insight for the materialization of the Kitaev model.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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