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μSR study of spin dynamics in LiY_(1-x)Ho_xF_4

机译:LiY_(1-x)Ho_xF_4中自旋动力学的μSR研究

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摘要

We present zero-field positive muon spin relaxation (μSR) measurements for LiY_(1-x)Ho_xF_4 samples with x = 0.0017, 0.0085, 0.0406, and 0.0855. We characterize the dynamics associated with the formation of the (F-μ-F)-complex by comparing our data with Monte Carlo simulations to determine the concentration range over which the spin dynamics are determined primarily by the Ho~(3+)-μ interaction rather than by the F-μ interaction. Simulations show that F-μ-F oscillations should evolve into a Lorentzian Kubo-Toyabe decay for an increasing static magnetic field distribution F (i.e., increasing x), but the data do not show this behavior, consistent with the recently reported existence of strong magnetic fluctuations in this system at low temperatures. Anisotropy in the field distribution is shown to cause small errors of the order of 10% from behavior predicted for an isotropic distribution. Finally, numerical calculations show that values of F calculated in the single-ion limit greatly exceed the values extracted from curve fits, suggesting that strong correlations play an important role in this system.
机译:我们提出了x = 0.0017、0.0085、0.0406和0.0855的LiY_(1-x)Ho_xF_4样本的零场正μ自旋弛豫(μSR)测量。通过将我们的数据与蒙特卡洛模拟进行比较,确定浓度范围,自旋动力学主要由Ho〜(3 +)-μ决定,从而表征与(F-μ-F)络合物形成相关的动力学。相互作用而不是F-μ相互作用。模拟表明,随着静磁场分布F的增加(即x的增加),F-μ-F振荡应演化为Lorentzian Kubo-Toyabe衰减,但数据未显示此行为,这与最近报道的强磁场的存在是一致的低温下该系统中的电磁波动。从各向同性分布的预测行为来看,场分布中的各向异性会引起约10%的小误差。最后,数值计算表明,在单离子极限中计算出的F值大大超过了从曲线拟合中提取的值,这表明强相关性在该系统中起着重要作用。

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