论文标题
MUON自旋放松研究Kitaev Honeycomb材料h $ _3 $ liir $ _2 $ o $ _6 $
Muon Spin Relaxation Study of Spin Dynamics on a Kitaev honeycomb material H$_3$LiIr$_2$O$_6$
论文作者
论文摘要
量子自旋液体（QSL）中的空缺效应已被广泛研究。 Kitaev模型中随机空缺的有限密度可以导致堆积状态的低能密度（DOS），通常在实验上通过热力学或磁化量的缩放行为来确定。在这里，我们报告了H $ _3 $ liir $ _2 $ o $ $ _6 $的详细MUON旋转放松（$μ$ SR），一个具有空缺的Kitaev QSL候选人。缺乏磁性顺序降低到80 mk，并且发现自旋波动在低温下是持续的。有趣的是，观察到纵向场（LF）的时场缩放定律 - $μ$ SR极化降至0.1K。这表明动态缩放量表，其关键指数0.46与特定热和磁化数据的缩放行为非常一致。所有观察结果都指向有限的DO，上面$ n（e）\ sim e^{ - 0.5} $，在空缺的情况下，这是Kitaev QSL的预期。我们的μSR研究提供了幂律低能DOS的动态指纹，并引入了对QSL空缺效应的重要新见解。
The vacancy effect in quantum spin liquid (QSL) has been extensively studied. A finite density of random vacancies in the Kitaev model can lead to a pileup of low-energy density of states (DOS), which is generally experimentally determined by a scaling behavior of thermodynamic or magnetization quantities. Here, we report detailed muon spin relaxation ($μ$SR) results of H$_3$LiIr$_2$O$_6$, a Kitaev QSL candidate with vacancies. The absence of magnetic order is confirmed down to 80 mK, and the spin fluctuations are found to be persistent at low temperatures. Intriguingly, the time-field scaling law of longitudinal-field (LF)-$μ$SR polarization is observed down to 0.1 K. This indicates a dynamical scaling, whose critical exponent 0.46 is excellently consistent with the scaling behavior of specific heat and magnetization data. All the observations point to the finite DOS with the form $N(E) \sim E^{-0.5}$ , which is expected for the Kitaev QSL in the presence of vacancies. Our μSR study provides a dynamical fingerprint of the power-law low-energy DOS, and introduces a crucial new insight into the vacancy effect in QSL.
