Magnetic excitations and interactions in the Kitaev hyperhoneycomb iridate ß - Li 2 IrO 3
Magnetic excitations and interactions in the Kitaev hyperhoneycomb iridate ß - Li 2 IrO 3
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Kitaev 超蜂窝铱酸盐中的磁激发和相互作用 - Li 2 IrO 3
DOI：
10.1103/physrevb.106.064423
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发表时间：
2022
影响因子：
3.7
通讯作者：
Halloran T
中科院分区：
文献类型：
--
作者：
Halloran T
我们提出了一个彻底的实验研究的三维超蜂窝Kitaev磁铁，使用非弹性中子散射（INS），时域太赫兹光谱（THEMS），和热容测量的组合。主要结果包括INS光谱权重的大规模低温重组，其演变为以12 meV为中心的宽峰，以及2.8（1）meV处的太赫兹数据中的独特峰。与粉末平均自旋波理论计算的详细比较表明，这两个特征的位置分别由各向异性耦合和海森堡交换控制。精细的微观自旋模型非常接近Kitaev自旋液相。
We present a thorough experimental study of the three-dimensional hyperhoneycomb Kitaev magnet, using a combination of inelastic neutron scattering (INS), time-domain terahertz spectroscopy (TDTS), and heat capacity measurements. The main results include a massive low-temperature reorganization of the INS spectral weight that evolves into a broad peak centered around 12 meV, and a distinctive peak in the terahertz data at 2.8(1) meV. A detailed comparison to powder-averaged spin-wave theory calculations reveals that the positions of these two features are controlled by the anisotropiccoupling and the Heisenberg exchange, respectively. The refined microscopic spin model placesin close proximity to the Kitaev spin liquid phase.