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首页> 外文期刊>Physical Review X >Hierarchy of Exchange Interactions in the Triangular-Lattice Spin Liquid YbMgGaO 4
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Hierarchy of Exchange Interactions in the Triangular-Lattice Spin Liquid YbMgGaO 4

机译：三角晶格自旋液体YbMgGaO 4中交换相互作用的层次

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The spin- 1 / 2 triangular lattice antiferromagnet YbMgGaO 4 has attracted attention recently as a quantum spin-liquid candidate with the possible presence of off-diagonal anisotropic exchange interactions induced by spin-orbit coupling. Whether a quantum spin liquid is stabilized or not depends on the interplay of various exchange interactions with chemical disorder that is inherent to the layered structure of the compound. We combine time-domain terahertz spectroscopy and inelastic neutron scattering measurements in the field-polarized state of YbMgGaO 4 to obtain better insight of its exchange interactions. Terahertz spectroscopy in this fashion functions as a high-field electron spin resonance and probes the spin-wave excitations at the Brillouin zone center, ideally complementing neutron scattering. A global spin-wave fit to all our spectroscopic data at fields over 4?T, informed by the analysis of the terahertz spectroscopy linewidths, yields constraints on the disorder-averaged g factors and exchange interactions. Our results paint YbMgGaO 4 as an easy-plane X X Z antiferromagnet with the combined and necessary presence of subleading next-nearest neighbor and weak anisotropic off-diagonal nearest-neighbor interactions. Moreover, the obtained g factors are substantially different from previous reports. This work establishes the hierarchy of exchange interactions in YbMgGaO 4 from high-field data alone and thus strongly constrains possible mechanisms responsible for the observed spin-liquid phenomenology.
机译：自旋1/2三角晶格反铁磁体YbMgGaO 4作为量子自旋液体候选物最近引起了人们的关注，它可能存在自旋轨道耦合引起的非对角各向异性交换相互作用。量子自旋液体是否稳定取决于化合物的层状结构所固有的各种交换相互作用与化学无序的相互作用。我们结合时域太赫兹光谱学和非弹性中子散射测量在YbMgGaO 4的场极化状态下获得其交换相互作用的更好的见解。太赫兹光谱以这种方式充当高场电子自旋共振，并在布里渊区中心探测自旋波激发，理想地补充中子散射。在太赫兹光谱线宽分析的基础上，一个全局自旋波适合我们在4？T以上的所有光谱数据，对无序平均g因子和交换相互作用产生了约束。我们的研究结果将YbMgGaO 4漆成易平面X X Z Z的反铁磁体，并结合了必要的次导近邻和弱各向异性的非对角最近邻相互作用。此外，获得的g因子与以前的报告有很大不同。这项工作仅从高场数据建立了YbMgGaO 4中交换相互作用的层次结构，因此强烈地限制了所观察到的自旋液体现象学的可能机制。

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