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arXiv 1807.06192cond-mat.str-el
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$α$ $_3$中的场致中间相:非共面有序、phase diagram和近似自旋液体

Field-induced intermediate phase in $α$-RuCl$_3$: Non-coplanar order, phase diagram, and proximate spin liquid

P. Lampen-Kelley, L. Janssen, E. C. Andrade, S. Rachel, J. -Q. Yan, C. Balz, D. G. Mandrus, S. E. Nagler, M. Vojta

摘要:

具有强自旋轨道耦合的受抑磁体有望承载物质的拓扑状态,具有分数激发和涌现的规范场。Kitaev关于蜂窝晶格Majorana自旋液体的提议引发了对实验实现的强烈搜索,其中键依赖的伊辛相互作用是基本的构建块。一个主要的候选物是$α$ $_3$,然而,迄今为止还不了解其在磁场中的相图。在这里,我们提出了确凿的实验证据,一种新的场诱导有序相在$α$ -RuCl $_3$,夹在锯齿形和量子无序相在低和高场,分别。我们提供了一个详细的理论研究相关的有效自旋模型,我们显示,显示场诱导的中间阶段以及。我们充分描述了该模型中的中间相,包括其复杂的自旋结构,并根据实验观察到的临界场确定了与$α$ -RuCl $_3$相关的参数。最重要的是,我们的研究将$α$ -RuCl $_3$的物理学与Kitaev- $Γ$模型的物理学联系起来,Kitaev- $Γ$模型在零场中显示量子自旋液体,从而揭示了其签名已在$α$ -RuCl $_3$的各种动力学探针中检测到的自旋液体。

英文摘要:

Frustrated magnets with strong spin-orbit coupling promise to host topological states of matter, with fractionalized excitations and emergent gauge fields. Kitaev's proposal for a honeycomb-lattice Majorana spin liquid has triggered an intense search for experimental realizations, with bond-dependent Ising interaction being the essential building block. A prime candidate is $α$-RuCl$_3$ whose phase diagram in a magnetic field is, however, not understood to date. Here we present conclusive experimental evidence for a novel field-induced ordered phase in $α$-RuCl$_3$, sandwiched between the zigzag and quantum disordered phases at low and high fields, respectively. We provide a detailed theoretical study of the relevant effective spin model which we show to display a field-induced intermediate phase as well. We fully characterize the intermediate phase within this model, including its complex spin structure, and pinpoint the parameters relevant to $α$-RuCl$_3$ based on the experimentally observed critical fields. Most importantly, our study connects the physics of $α$-RuCl$_3$ to that of the Kitaev-$Γ$ model, which displays a quantum spin liquid phase in zero field, and hence reveals the spin liquid whose signatures have been detected in a variety of dynamical probes of $α$-RuCl$_3$.

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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