Neutron scattering investigation of proposed Kosterlitz-Thouless transitions in the triangular-lattice Ising antiferromagnet TmMgGaO4
Neutron scattering investigation of proposed Kosterlitz-Thouless transitions in the triangular-lattice Ising antiferromagnet TmMgGaO4
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DOI：
10.1103/physrevb.103.064424
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发表时间：
2020-11
影响因子：
3.7
通讯作者：
Z. Dun;Marcus Daum;R. Baral;H. Fischer;H. Cao;Yaohua Liu;M. Stone;J. Rodriguez-Rivera;E. Choi;Qing Huang;Haidong Zhou;M. Mourigal;B. Frandsen
中科院分区：
文献类型：
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作者：
Z. Dun;Marcus Daum;R. Baral;H. Fischer;H. Cao;Yaohua Liu;M. Stone;J. Rodriguez-Rivera;E. Choi;Qing Huang;Haidong Zhou;M. Mourigal;B. Frandsen
Kosterlitz-Thouless相变描述了2DXY模型中由于涡旋-反涡旋对的结合而产生的拓扑相变。通过将磁矩映射到位于晶格每个三角形中心的复序参数上，理论上可以在三角形伊辛反铁磁体中出现Kosterlitz-Thouless物理。在这里，作者通过中子散射和对实空间和倒易空间中的自旋关联的模拟研究，在稀土材料TmMgGaO$4中找到了支持这种物理的证据。这项研究表明，即使在存在结构无序的情况下，稠密的自旋系统也可以被研究和控制，以寻找拓扑相变。
The Kosterlitz-Thouless transition describes a topological phase transition in the 2D XY model resulting from the binding of vortex-antivortex pairs. Kosterlitz-Thouless physics can theoretically emerge in triangular Ising antiferromagnets by mapping magnetic moments onto a complex order parameter residing at the center of each triangle of the lattice. Here, the authors find supporting evidence for such physics in the rare-earth material TmMgGaO${}_{4}$ through neutron scattering and modeling studies of spin correlations in both real and reciprocal space. This research shows that dense spin systems, even in the presence of structural disorder, can be investigated and controlled in search for topological phase transitions.