Anisotropic magnetic excitations from single-chirality antiferromagnetic state in Ca-kapellasite
Anisotropic magnetic excitations from single-chirality antiferromagnetic state in Ca-kapellasite
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Ca-kapellasite 中单手性反铁磁态的各向异性磁激发
DOI：
10.1103/physrevresearch.2.023269
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发表时间：
2020
影响因子：
4.2
通讯作者：
Sasaki T.
中科院分区：
文献类型：
--
作者：
Ihara Y.;Yoshida H.;Arashima K.;Hirata M.;Sasaki T.
我们给出了自旋完美Kagome反铁磁体Ca-kapellasite的核磁共振研究。基态的静态磁结构是由有限的Dzyaloshinskii-Moriya相互作用选择的手性有序结构。用核自旋晶格驰豫速率测量方法研究了有序态的低能磁激发。在垂直于Kagome平面的磁涨落中，除了Kagome平面内的色散自旋波贡献外，我们还发现了一个微弱的温度相关贡献。来自共面自旋结构的低能磁激发归因于Kagome反铁磁体中源于平带的零模。
We present aNMR study for the spinperfect kagome antiferromagnet Ca-kapellasitewith a magnetic transition at. The static magnetic structure in the ground state has been determined to be a chirality-orderedstate, which is selected by a finite Dzyaloshinskii-Moriya interaction. The low-energy magnetic excitations in the ordered state are investigated by a nuclear spin-lattice relaxation rate measurement. We detect a weakly temperature-dependent contribution in the magnetic fluctuations perpendicular to the kagome plane in addition to the dispersive spin-wave contribution in the kagome plane. The low-energy magnetic excitations from the coplanar spin structure are attributed to the zero mode originating from the flat band in this kagome antiferromagnet.