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arXiv 0910.5486cond-mat.str-elcond-mat.other
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用$μ$ SR研究$LiHo_xY_{1-x}F_4$的基态性质

Study of the ground state properties of $LiHo_xY_{1-x}F_4$ using $μ$SR

J. Rodriguez, A. A. Aczel, J. P. Carlo, S. R. Dunsiger, G. J. MacDougall, P. L. Russo, A. T. Savici, Y. J. Uemura, C. R. Wiebe, G. M. Luke

摘要:

$LiHo_xY_{1-x}F_4$是一种绝缘系统,其中磁性Ho $^{3+}$离子具有Ising特性,并且主要通过磁偶极场相互作用。我们用μ子自旋弛豫技术研究了x=0.25,0.12,0.08,0.045和0.018的样品的基态的性质。与以前的一些工作相比,我们没有发现任何典型的自旋玻璃行为的签名下降到$\approx$ 15 mK。相反,低于$\approx$ 300 mK,我们观察到动态磁性的特点是一个单一的相关时间与温度无关的波动率。我们观察到,这种低的温度波动率随着x的增加而增加,直到0.08,高于0.08时,温度波动率趋于稳定。300 mK的能量标度对应于Ho ~(3+)超精细相互作用的强度,表明超精细相互作用可能与该体系的自旋动力学密切相关。

英文摘要:

$LiHo_xY_{1-x}F_4$ is an insulating system where the magnetic Ho$^{3+}$ ions have an Ising character, and interact mainly through magnetic dipolar fields. We used the muon spin relaxation technique to study the nature of the ground state for samples with x=0.25, 0.12, 0.08, 0.045 and 0.018. In contrast with some previous works, we have not found any signature of canonical spin glass behavior down to $\approx$15mK. Instead, below $\approx$300mK we observed dynamic magnetism characterized by a single correlation time with a temperature independent fluctuation rate. We observed that this low temperature fluctuation rate increases with x up to 0.08, above which it levels off. The 300mK energy scale corresponds to the Ho3+ hyperfine interaction strength, suggesting that the hyperfine interaction may be intimately involved with the spin dynamics in this system.

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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